Thursday

October 23, 2014

October 23, 2014

Number of results: 8,129

**statistics**

if i have k = 36.86 +/- 4.78 and v = 113 +/- 9.92 both using 95% confidence limits and no true values of k or v given am i right in saying that accuracy cannot be determined and that v is a more precise measurement my question was to comment on what can be said about the ...
*January 18, 2010 by jemmy*

**statistics**

if i have k = 36.86 +/- 4.78 and v = 113 +/- 9.92 both using 95% confidence limits and no true values of k or v given am i right in saying that accuracy cannot be determined and that v is a more precise measurement my question was to comment on what can be said about the ...
*January 18, 2010 by jemmy*

**statistics **

Experts consider high serum cholesterol levels to be associated with an increased incidence of coronary heart disease .suppose that the logarithm of cholesterol levels for males in a given age bracket are normally distributed with mean of 2.35 and a standard deviation of 12 . ...
*November 14, 2010 by koky*

**Statistics**

A manufacturer of sports equipment claims that the new fishing line has a mean breaking strength of at least 8 kilograms. Test this claim if a sample of 28 lines found that the mean breaking strength is 7.8 Kg with sample standard deviation 0.5 Kg. The distribution is ...
*December 8, 2011 by Kori*

**Statistics**

Suppose that the probability distribution of a random variable x can be described by the formula P(x) = x/15 For each of the values x = 1, 2, 3, 4, and 5. For examples, then, p(x=2) = p(2) = 2/15 a Write out the probability distribution of x. b Show that the probability ...
*October 26, 2009 by Chinadoll*

**STATS**

The top selling Red and Voss tire is rated 70,000 miles means nothing. In fact, the distance the tires can run until they wear out is a normally distributed random variable with a mean of 82,000 miles and a standard deviation of 6,400. a. What is the probability that a tire ...
*September 16, 2011 by SANDRA*

**Sampling Distribution Complete solutions and illus**

Sampling Distribution Complete solutions and illustrations are required. 1.The average annual salary for all U.S. teachers is $29,863. Assume that the distribution is normal and the standard deviation is $5,200. a.Find the probability that a randomly selected teacher earns at ...
*February 27, 2013 by Rhea*

**statistics**

Womens heights are normally distributed with a mean of 162 cm and standard deviation of 16 cm. a. Define an random variable, X, and describe its full distribution including the mean and variance. b. What percentage of heights are greater than 180 cm ? c. What height is at the...
*December 4, 2011 by Jasmine*

**statistics**

The amount of corn chips dispensed into a 16-ounce bag by the dispensing machine has been identified at possessing a normal distribution with a mean of 16.5 ounces and a standard deviation of 0.1 ounce. Suppose 400 bags of chips were randomly selected from this dispensing ...
*November 8, 2011 by UG*

**statistic help**

Z score for worlds tallest man- Bao Xishun is the worlds tallest man with a height of 92.95 inch(or 7ft,8.95 inch).men have heights with a mean of 69.6 in. And a standard deviation of 2.8 in. 1. Convert Boa's height to a z score? 2. Does Boa's height meet the criterion of ...
*September 18, 2011 by samantha*

**government law**

Today freedom of speech is limited in interest of public safety by the clear and present danger test. Do you feel this is a good standard? or do you want to use another standard?
*November 10, 2008 by elley*

**Statistics **

The amount of soda a dispensing machine pours into a 12 ounce can of soda follows a normal distribution with a standard deviation of 0.12 ounces. Every can that has more than 12.30 ounces of soda poured into it causes a spill and the can needs to go through a special cleaning ...
*December 7, 2012 by Allison *

**statistics**

A provincial politician would like to determine the average amount earned during summer employment by the provinces teenagers during the past summers vacation period. She wants to have 95% confidence that the sample mean is within $25 of the actual population mean. Bases on ...
*December 9, 2012 by Anonymous*

**Statistics**

A provincial politician would like to determine the average amount earned during summer employment by the provinces teenagers during the past summers vacation period. She wants to have 95% confidence that the sample mean is within $25 of the actual population mean. Bases on ...
*December 9, 2012 by Maria Elizabeth*

**statistics**

can anyone help me with this problem? a sample of n=9 indivividuals was selected from a normally distributed pop. with a mean of M=25 and a standard deviation of 6.a treatment was administered to the sample, and treatment , the nine individuals produced the following score: 36...
*November 5, 2009 by simi*

**Stats**

Suppose that a random sample of adults has a mean score of on a standardized personality test, with a standard deviation of . (A higher score indicates a more personable participant.) If we assume that scores on this test are normally distributed, find a confidence interval ...
*November 19, 2011 by Anonymous*

**Chem**

In conjunction with a standard hydrogen electrode, the La3+|La half-cell is the anode and the standard cell potential is 2.52V. What is the standard reduction potential for the La3+|La half-cell?
*March 31, 2008 by Ginger*

**statistics**

The MacBurger restaurant chain claims that the waiting time of customers for service is normally distributed, with a mean of 3 minutes and a standard deviation of 1 minute. The quality-assurance department found in a sample of 50 customers at the Warren Road MacBurger that the...
*June 23, 2008 by Renee*

**statistics**

4. A large company insists that all job applicants who are invited for an interview take a psychometric test. The results of these tests follow a normal distribution with a mean of 61% and a standard deviation of 7.2%. a) What proportion of applicants would be expected to ...
*November 5, 2011 by victor*

**Chemistry**

Consider the isomerization equlibria of an alkene (C4H8) that co-exists as three isomers. (These 3 are in an equlibrium triangle) Reaction 1: cis-2-butene ⇔ trans-2-butene Reaction 2: cis-2-butene ⇔ 2-methylpropene Reaction 3: trans-2-butene ⇔ 2-methylpropene...
*March 3, 2013 by Gleb*

**statistic**

one of the major U.S. tire makers wishes to review its warranty for their rainmaker tire. The warranty is for 40,000 miles. The tire company beleives that the tire actually lasts more than 40,000 miles. A sample of 49 tires reveales that the mean number of miles is 45,000 ...
*December 10, 2012 by HN*

**Alegebra**

A physical fitness association is including the mile run in its secondary-school fitness test. The time for this event for boys in secondary school is known to possess a normal distribution with a mean of 450 seconds and a standard deviation of 50 seconds. Find the probability...
*August 8, 2009 by Samantha*

**Statistics**

Dr. Hernandez plans to measure FEV in a random sample of n young women from a certain popu- lation, and to use the sample mean y ̄ as an estimate of the population mean. Let A be the event that Hernandezs sample mean will be within 100 ml of the popula- tion mean. ...
*May 4, 2014 by Audrey*

**statistics**

The U.S. Department of Agriculture claims that the mean consumption of coffee by the person in the United States is 24.2 gallons per year. A random sample of 120 people in the United States shows that the mean coffee consumption is 23.5 gallons per year with a standard ...
*April 2, 2012 by Mike*

**Statistics**

2. On a certain anxiety questionnaire, the population is known to have a mean of 12 and a standard deviation of 2.3. A higher score represents higher levels of anxiety. Participants in a new relaxation program complete the questionnaire after completing the program, and have a...
*February 19, 2014 by daniel*

**Chem**

For the reaction, 3C2H2(g) ===> C6H6 at 25C, the standard enthalpy change is -631 kJ and the standard entropy change is -430 J/K, Calculate the standard free energy change (in kJ) at 25C. What is the formula that relates stand. entropy, enthalpy and free energy changes?
*March 30, 2008 by Ginger*

**chemistry... HELP**

Equilibrium constant question!!!? Standard reduction potentials Reduction half-reaction E(V) Ag+(aq) + e- ---> Ag (s) 0.80 Cu ^2+ (aq) + 2e- ---> Cu (s) 0.34 Sn^4+(aq) + 4e- ---> Sn (s) 0.15 2 H+(aq) + 2e- ---> H2 (g) 0 Ni^2+(aq) + 2e- ---> Ni (s) -0.26 Fe^2+ (...
*November 3, 2012 by Ann*

**Calculus**

According to the National Health Survey, the heights of adult males in the United States are normally distributed with mean 69.0 inches and standard deviation 2.8 inches. A. What is the probability that an adult male chosen at random is between 61 inches and 71 inches tall? B...
*November 3, 2013 by Robin*

**statistics**

A state administered standardized reading exam is given to eighth grade students. The scores on this exam for all students statewide have a normal distribution with a mean of 507 and a standard deviation of 60. A local Junior High principal has decided to give an award to any ...
*September 4, 2014 by Brandy*

**hypothesis testing and CI**

A hypothesis test for a population mean is to be performed at the 5% level of significance. The population standard deviation is known. The hypotheses are H0: = 80 Ha: 80. A 95% confidence interval for is also constructed. True or false, if 80 lies within the 95% ...
*November 10, 2010 by lubna*

**Math**

According to a student project for statistics 250, the amount of money spent on texts per semester by the population of students at a small liberal arts college is normally distributed with a mean of $426 and a standard deviation of $54. Determine the percent of all samples of...
*October 29, 2008 by Mary*

**statistics**

1. The time required to complete a project is normally distributed with a mean of 80 weeks and a standard deviation of 10 weeks. The construction company must pay a penalty if the project is not finished by the dues date of the contract. If a construction company bidding on ...
*February 21, 2012 by Gracie*

**Statistics**

As reported in Runner's World magazine, the times of the finishers in the new york 10 km run are normally distrubted with a mean of 1.02 hours and a standard deviation of 9 minutes. Let X denote finishing time for the finishers. Then, A. Find the percentage of finishers with ...
*March 14, 2013 by Anonymous*

**statistics**

A bottling commpany produces bottles that hold 10 ounces of liquid . Periodically, the company gets complaints that their bottles are not holding enough liquid. To test this claim, the bottling company randomly samples 25 bottles and finds the average amount of liquid held by ...
*May 22, 2014 by Anonymous*

**chemistry**

The aspirin content in the analgesic tablets is determined from 120 samples to have a ean of 250 mg with a standard deviation of 5 mg. from a production line, what percentage of the tablets are expected to contain between 243 and 262 mg of aspirin?What is the 95 % confidence ...
*September 13, 2008 by jimmy*

**chemistry**

The aspirin content in the analgesic tablets is determined from 120 samples to have a ean of 250 mg with a standard deviation of 5 mg. from a production line, what percentage of the tablets are expected to contain between 243 and 262 mg of aspirin?What is the 95 % confidence ...
*September 13, 2008 by Jimmy*

**Statistics**

I am a big shot research scientist at Washington University where I am using 2ebrafish to study neuronal migration. My graduate students measured 40 fish and found that the mean length of the fish sampled was 3.7 cm with a standard deviation of 0.5 cm. Construct a 95% ...
*May 4, 2014 by Linda*

**Chemistry**

The standard free energy of activation of a reaction A is 73.4 kJ mol1 (17.5 kcal mol1) at 298 K. Reaction B is one million times faster than reaction A at the same temperature. The products of each reaction are 10.0 kJ mol1 (2.39 kcal mol1) more stable than the reactants...
*September 8, 2014 by Breauna*

**ap stats**

all students in a pe class completed a basketball free throw shooting event and the highest number of shots made was 32. the next day a student who had transferred into the school completed the event, making 35 shots. indicate whether adding the new student's score to the rest...
*August 29, 2012 by ash*

**statistics**

According to a bank, the time taken by its customers to use cash dispensing machines is normally distributed with a mean of 18 seconds and a standard deviation of 3 seconds. I) What is the probability that a customer selected at random takes less than 13 seconds? II) Find the ...
*November 5, 2011 by victor*

**stats.**

The GMAT test is required for admission to most graduate programs in business. In a recent year, the GMAT test scores were normally distributed with a mean of 550 and standard deviation of 100. A. Find the first quartile for the distribution of GMAT scores. B. Find the median ...
*March 18, 2013 by Christina*

**statistics**

The grades on the final examination given in a large organic chemistry class are normally distributed with a mean of 72 and a standard deviation of 8. The instructor of this class wants to assign an A grade to the top 10% of the scores, a B grade to the next 10% of the ...
*March 24, 2013 by Sarah*

**statistics**

The Graduate Record Exam (GRE) has a combined verbal and quantitative mean of 1000 and a standard deviation of 200. Scores range from 200 to 1600 and are approximately normally distributed. What percentage score above 1300? What percentage score above 800? What percentage ...
*September 21, 2014 by Jeremy*

**Statistics**

The head librarian claims that books have been checked out an average of seven times in the last year. You suspect she has exaggerated the checkout rate and that the mean number of checkouts per book per year is, in fact, less than seven. Using the computerized card catalog, ...
*May 2, 2008 by Lindy*

**Statistics**

A person's level of blood glucose and diabetes are closely related. Let x be a random variable measured in milligrams of glucose per deciliter (1/10 of a liter) of blood. Suppose that after a 12-hour fast, the random variable x will have a distribution that is approximately ...
*June 20, 2010 by Alex*

**statistics**

A physical fitness association is including the mile run in its secondary-school fitness test. The time for this event for boys in secondary school is known to possess a normal distribution with a mean of 440 seconds and a standard deviation of 60 seconds. Find the probability...
*March 1, 2011 by jackie*

**Psychology**

A distribution has a standard deviation of _ _ 12. Find the z-score for each of the following locations in the distribution. a. Above the mean by 3 points. b. Above the mean by 12 points. c. Below the mean by 24 points. d. Below the mean by 18 points.
*January 21, 2012 by Sharon*

**Statistics**

A random sample of 51 of the largest companies in the united states gave the following P/e ratios 11 35 19 13 15 21 40 18 60 72 9 20 29 53 16 26 21 14 21 27 10 12 47 14 33 14 18 17 20 19 13 25 23 27 5 16 8 49 44 20 27 8 19 12 31 67 51 26 19 18 32 Use a calculator with mean and...
*June 11, 2011 by Anonymous*

**Statistics**

A random sample of 51 of the largest companies in the united states gave the following P/e ratios 11 35 19 13 15 21 40 18 60 72 9 20 29 53 16 26 21 14 21 27 10 12 47 14 33 14 18 17 20 19 13 25 23 27 5 16 8 49 44 20 27 8 19 12 31 67 51 26 19 18 32 Use a calculator with mean and...
*June 11, 2011 by Anonymous*

**statistics**

A random sample of 51 of the largest companies in the united states gave the following P/e ratios 11 35 19 13 15 21 40 18 60 72 9 20 29 53 16 26 21 14 21 27 10 12 47 14 33 14 18 17 20 19 13 25 23 27 5 16 8 49 44 20 27 8 19 12 31 67 51 26 19 18 32 Use a calculator with mean and...
*June 11, 2011 by Anonymous*

**statistics**

A random sample of 51 of the largest companies in the united states gave the following P/e ratios 11 35 19 13 15 21 40 18 60 72 9 20 29 53 16 26 21 14 21 27 10 12 47 14 33 14 18 17 20 19 13 25 23 27 5 16 8 49 44 20 27 8 19 12 31 67 51 26 19 18 32 Use a calculator with mean and...
*June 11, 2011 by Anonymous*

**Math please help!**

According to a student project for statistics 250, the amount of money spent on texts per semester by the population of students at a small liberal arts college is normally distributed with a mean of $426 and a standard deviation of $54. Determine the percent of all samples of...
*October 30, 2008 by Mary*

**statistics**

Information given:the distribution of male head circumference (HC) is normal with a mean of 56cm and a standard deviation of 1.8cm first question -the prob that HC of a random chosen man is larger than 57.8cm is? Work: pr(x)>57.8cm z=(57.8-56)=1.8--->.9641 i got it wrong...
*April 15, 2010 by UPD*

**Stats**

nformation given:the distribution of male head circumference (HC) is normal with a mean of 56cm and a standard deviation of 1.8cm first question -the prob that HC of a random chosen man is larger than 57.8cm is? Work: pr(x)>57.8cm z=(57.8-56)=1.8--->.9641 i got it wrong...
*April 15, 2010 by UPD*

**Math grd 12**

The number of nuts in a package of Nutty's premium cashews is normally distributed with mean of 432.4 nuts and standard deviation of 5.8 nuts packages with fewer than 420 nuts or more than 445 nuts will be rejected by quality control a) what is the probability that a package ...
*January 19, 2011 by Celina*

**stats**

The percent of fat calories that a person that in America consumes each day is normallydistributed with a mean of 36 and a standard deviation of 10. Suppose that 16 individuals are randomly chosen for an experiment. 1. Completely describe the distribution of sample means for ...
*April 28, 2013 by Kayla*

**Statistics**

An IQ test is designed so that the mean is 100 and the standard deviation is 19 for the population of normal adults. Find the sample size necessary to estimate the mean IQ score of statistics students such that it can be said with 95% confidence that the sample mean is within ...
*February 12, 2014 by Stephanie*

**FINANCE**

Assume the returns from holding small-company stocks are normally distributed. Also assume the average annual return for holding the small-company stocks for a period of time was 16.5 percent and the standard deviation of those stocks for the period was 32.5 percent. Use the ...
*April 2, 2014 by Alec*

**statistics**

A human resources manager wants to determine a confidence interval estimate for the mean test score for the next office-skills test to be given to a group of job applicants. In the past, the test scores have been normally distributed with a mean of 74.2 and a standard ...
*June 19, 2013 by Rald*

**Chem**

This is also from the lab concerning activity serious of metals and calculation of electrode portentions... Question: What are the standard conditions for measuring potentials? Does that mean... Standard condition for temp: 298K Concentration: 1 molar concentration Pressure: 1...
*March 28, 2007 by Marisol*

**Stats**

A new extended-life light bulb has an average service life of 750 hours, with a standard deviation of 50 hours. If the service life of these light bulbs approximates a normal distribution, about what percent of the distribution will be between 600 and 900 hours? a. 95 percent...
*December 13, 2011 by Stephanie F*

**statistics**

An agricultural economist is interested in determining the average diameter of peaches produced by a particular tree. A random sample of 50 peaches is taken and the sample mean calculated. Suppose that the average diameter of peaches on this tree is known from previous years' ...
*March 26, 2012 by Pat*

**Statistics**

The Boeing 757-200 ER airliner carries 200 passengers and has doors with a height of 72 inches. Heights of men are normally distributed with a mean of 69 inches and a standard deviation of 2.8 inches. b) assume that half of the 200 passengers are men, what doorway height ...
*April 8, 2013 by Liz*

**Finance**

Veggie Burgers, Inc., would like to maintain its cash account at a minimum level of $246,400; but expect the standard deviation in net daily cash flows to be $13,600; the effective annual rate on marketable securities to be 4.8 percent per year; and the trading cost per sale ...
*May 15, 2010 by Hans*

**HELP MATH **

lee looked at the results of an exam he had just given to his grade 2 math class. he saw that louise had a score of 95%. he also saw that the standard deviation for the test was 0. if arif was also in his grade 2 math class, what mark did arif get on the exam?
*January 6, 2011 by Anonymous*

**Finance**

21. Consider an economy with two types of firms, S and I. S firms all move together. I firms move independently. For both types of firms, there is a 60% probability that the firms will have a 15% return and a 40% probability that the firms will have a -10% return. What is the ...
*August 2, 2010 by Anonymous*

**Statistics**

According to a study by the Centers for Disease Control, the national mean hospital stay after childbirth is 2.1 days. Reviewing records at her own hospital, a hospital administrator calculates that the mean hospital stay for a random sample of 81 women after childbirth is 2.3...
*November 9, 2013 by Michael*

**statistics**

A simple random sample of 60 items resulted in a sample mean of 80. The population standard deviation is 15. a) Compute the 95 % confidence interval for the population mean. b) Assume that the same sample mean was obtained from a sample of 120 items. Provide a 95% confidence ...
*April 7, 2011 by TIMBERLY*

**Statistics**

. A random sample is selected from a normal population with a mean of __40 and a standard deviation of __10. After a treatment is administered to the individuals in the sample, the sample mean is found to be M _ 42. a. How large a sample is necessary for this sample mean to be...
*January 26, 2012 by Sharon*

**English**

How do you know whan a word is in standard or non-standard Canadian English? Many dictionaries contain this information. If you live in Canada, please check your library for a dictionary that shows standard and non-standard Canadian usage. Also -- Dictionary.com (and other ...
*October 18, 2006 by Gina*

**Accounting Math**

A standard costing system is the traditionally used costing system. It has two main purposes: cost control and product costing. Standard costs are determined by accountants working together with other employees of the organization. Which employees outside of accounting do you ...
*June 20, 2013 by Tameika*

**Math-Statistics-please doublecheck my answers**

In the fall of 2000, 54% of the almost 34,000 first-year students attending one of the California State Universities had strong enough math skills to take an entry level course. 1)Based on a sample of 20 students, can we assume our calculations will be accurate? My answer is: ...
*January 31, 2012 by Mandy*

**Statistics**

The average annual salary of employees at Wintertime Sports was $28,750 last year. This year the company opened another store. Suppose a random sample of 18 employees had an average annual salary of $25,810 with standard deviation of s = $4230. Use a 1% level of significance ...
*March 25, 2012 by Jasmine*

**Statistics**

A random sample of 16 mid-sized cars tested for fuel consumption gave a mean of 26.4 kilometers per liter with a standard deviation of 2.3 kilometers per liter. i) Assuming that the kilometers per liter given by all mid-sized cars have a normal distribution, find a 99% ...
*May 11, 2012 by Nesa*

**STAT 250 Probability**

Final averages are typically approximately normally distributed with a mean of 66 and a standard deviation of 10.5. Your professor says that the top 5% of the class will receive an A; the next 15%, a B; the next 47%, a C; the next 22%, a D; and the bottom 11%, an F. (a) What ...
*March 20, 2013 by Jane Segurra*

**STAT 250 Probability**

Final averages are typically approximately normally distributed with a mean of 66 and a standard deviation of 10.5. Your professor says that the top 5% of the class will receive an A; the next 15%, a B; the next 47%, a C; the next 22%, a D; and the bottom 11%, an F. (a) What ...
*March 20, 2013 by Jane Segurra*

**Stats**

A random sample of 100 GMAT scores has a mean of 500. Assume that GMAT scores have a population standard deviation of 120. Construct a 95% confidence interval estimate of the mean GMAT scores. (15 pts) What is the sample size for the conference interval? What is the point ...
*October 12, 2014 by Lynn*

**Chemistry**

Tap water is measured for arsenic and found to have a mean signal of 0.006065. Next, a small amount of Arsenic is spiked into the tap water such that the new value is 0.50ppb higher than before. The mean signal from this new low-level concentration is 0.0391, with a standard ...
*December 10, 2011 by Ken*

**Word Problem**

Faced with rising fax costs, a firm issued a guideline that transmissions of 10 pages or more should be sent by 2-day mail instead. Exceptions are allowed, but they want the average to be 10 or below. The firm examined 35 randomly chosen fax transmissions during the next year...
*September 28, 2008 by Marilyn*

**Math**

The image of the public library is constantly changing, and their online services continue to grow. Usage of the library's home page grew by 17% during the past 12 months. It has been estimated that the current average length of a visit to the library's homepage is ...
*June 22, 2013 by JACKIE*

**math**

A company is considering implementing one of two quality control plans for monitoring the weights of automobile batteries that it manufactures. If the manifacturing process is working properly, the battery weights are approximatedly normally distributed with a specified mean ...
*October 3, 2007 by Anonymous*

**statistics**

Please only the formula and steps to do this problem. Thank you An assembly process includes a torque wrench device that automatically tightens compressor housing bolts; the device has a known process standard deviation of = 3 lb-ft in the torque applied. A simple random ...
*August 2, 2009 by Lina*

**statistics**

if a test has a mean of 150 and a standard deviation of 30, we know that: a)50% of the respondents scored between 180 and 210 b)68% of the responents scored above 120 c)50% of the respondents scored between 120 and 210 d) 96% of the respondents scored between 90 and 210
*November 21, 2012 by carly*

**Probabilty & Statistic**

A random sample is selected from a normal population with a mean of __40 and a standard deviation of __10. After a treatment is administered to the individuals in the sample, the sample mean is found to be M _ 42. a. How large a sample is necessary for this sample mean to be ...
*January 23, 2012 by Sharon*

**math**

a tire manufacturer believes that the tread life of its tires are normally distributed and will lst an average of 60,000 miles with a standard deviation of 3,000 miles. sixty-four randomly selected tires were tested and the average miles where the tire failed were recorded. ...
*May 31, 2011 by monk*

**statistics**

A survey was conducted to measure the number of hours per week adults spend on home computers. In the survey, the number of hours was normally distributed, with a mean of 8 hours and a standard deviation of 1 hour. A survey participant is randomly selected. Find the ...
*November 7, 2011 by lindsay*

**statistics**

It is known that the population mean for the Full Scale IQ of the WAIS is 100 with a standard deviation of 15. A researcher assesses a sample of 200 adults and find that they have a mean Full Scale IQ of 102. The point estimate of the mean for this group is ___________ and the...
*April 15, 2014 by Katie*

**Finite math**

Scores for men on the verbal portion of the SAT-I test are normally distributed with a mean of 509 and a standard deviation of 112. (a) If 1 man is randomly selected, find the probability that his score is at least 579. (b) If 13 men are randomly selected, find the probability...
*June 2, 2014 by Preet*

**Math Helppp**

Scores for men on the verbal portion of the SAT-I test are normally distributed with a mean of 509 and a standard deviation of 112. (a) If 1 man is randomly selected, find the probability that his score is at least 579. (b) If 13 men are randomly selected, find the probability...
*June 2, 2014 by TJ*

**Statistics**

. A certain company makes 12-volt car batteries. After many years of product testing, the company knows that the average life of a battery is normally distributed, with a mean of 45 months and a standard deviation of 7 months. If the company does not want to make refunds for ...
*June 20, 2010 by Jacob*

**chemistry**

You need to determine the concentration of a sulfuric acid solution by titration with a standard sodium hydroxide solution. You have a 0.1896 M standard solution. You take a 25.00 mL sample of the original acid solution and dilute it to 250.0 mL. You then take a 10.00 mL ...
*April 11, 2014 by Steven*

**Statistics**

A colleges data about the incoming freshmen indicates that the mean of their high school GPAs was 3.4, with a standard deviation of 0.35; the distribution was roughly mound-shaped and only slightly skewed. The students are randomly assigned to freshman writing sem- inars in ...
*January 25, 2013 by Lissa*

**math help**

Consider the approximately normal population of heights of male college students with mean = 69 inches and standard deviation of = 4.6 inches. A random sample of 25 heights is obtained (e) Find P(x > 70). (Give your answer correct to four decimal places.) (f) Find P(x &...
*June 16, 2013 by Sue 7*

**statistics 201**

A firm hires a pool of financial consultants to discuss portfolio recommendations with its clients. The CEO believes that another financial consultant should be hired if the average phone consultation exceeds 350 seconds. A random sample of 100 phone calls revealed a mean of ...
*November 21, 2013 by lea *

**maths **

if i have k = 36.86 +/- 4.78 and v = 113 +/- 9.92 both using 95% confidence limits and no true values of k or v given am i right in saying that accuracy cannot be determined and that v is a more precise measurement my question was to comment on what can be said about the ...
*January 19, 2010 by lucy*

**statistics**

You are the manager at a company and are asked to present a report on the year-to-date performance of your division. What type of statistical information would you include in your report? In paticular, which descriptive statistics (mean,median, standard deviation,etc.) do you ...
*June 21, 2011 by triplec*

**Stats**

a teacher teaches two sections (A and B) of a class. Both sections have a mean score of 75. Section A only has 5 students and they all received a score of 75, while section B has 15 students with a mean score of 75 with a variance of 12. What is the standard deviation of the ...
*May 28, 2008 by Andrea*

**Statistics NEEED YOUR HELP ASAP!!!!!!!!!!!!!!**

The manufacturer of the X-15 steel-belted radial truch tire claims that the mean mileage the tire can be driven before the tread wears out is 80,000 km. The standard deviation of the mileage is 8,000 km. The Crosset Truck Company bought 48 tires and found that the mean mileage...
*April 3, 2010 by Samir*

**Statistics**

Are you annoyed with spam e-mail? Suppose a random sample of 200 Kent State students was asked this question of which 80% said that they are annoyed. From the provided information we can find the following: sample percent = 80% (sample proportion = .80) standard deviation (S.D...
*July 9, 2012 by Sheri*

**college stats**

can someone please explain the steps: suppose that the grade point average,denoted by X,of a university student is Normally distributed with the mean 2.786 and standard deviation 0.375 A). a student is on the deans list if her GPA exceeds 3.746. What percent of the students ...
*October 1, 2012 by damon*

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