Tuesday

December 6, 2016
Number of results: 39,253

**statistics**

solve: our health organization is interested in estimating the average value of outstanding accounts receivable. After selecting a sample of 100 accounts, suppose that the mean was $120 and the standard deviation was $40. Use these data to construct a 98% confidence interval. ...

*June 6, 2014 by Winona*

**statistics**

Jack’s ACT score is 30. Jason’s SAT score is 950. Who did better? The mean SAT score is 1000 with a standard deviation of 100 SAT points. The mean ACT score is 22 with a standard deviation of 3 ACT points

*March 27, 2012 by Chris*

**Statistic**

Twenty students assigned to an experimental group receive 30 in a control group has a mean of 38 on the test (with an estimated population standard deviation of 3); the control group has a mean of 35 (with an estimated population standard deviation of 5). Using the .05 level, ...

*October 11, 2009 by Anonymous*

**Statistics**

Assume there are two lakes containing trout and the weights of the trout in each lake are normally distributed. The distribution of trout weight in Lake A has a mean of 18 ounces with a standard deviation of 2 ounces. The distribution of trout weight in Lake B has a mean of 19...

*November 24, 2011 by Brea*

**statistics**

A study found that citizens spend on average $1950 per year on groceries with a standard deviation of $100. Assume that the variable is normally distributed. 5. Identify the population mean. 6. Identify the population standard deviation. 7. Find the probability that a sample ...

*April 19, 2013 by Cam*

**Sampling Distribution**

Sampling Distribution Complete solutions and illustrations are required. 5.The standard deviation of a variable is 15. If a sample of 100 individuals are selected compute for a.The standard error of the mean. b.What sample size is necessary to double the standard error of the ...

*February 27, 2013 by Tina*

**probability**

1. The time it takes a student to cycle to school is normally distributed with a mean of 15 minutes and a variance of 2. The student has to be at school at 8.00a.m. At what time should the student leave her house so that she will be late only 4% of the time? 2. In a study for ...

*April 10, 2011 by tan*

**English**

I am psueo conducting an experiment on 144 freshmen high school students who are evenly divided into 6 groups. The treatment group are receiving a new instructional strategy that the control group is not receiving. A t-test was conducted after a pre-test of a CBM measurement, ...

*August 3, 2012 by Anonymous*

**corporate financial**

check my answer if answer is diffferent show how you got it 1. Firm A uses straight-line depreciation. Firm B uses MACRS depreciation. Both firms bought $100,000 worth of equipment two years ago. The equipment has a 7-year life. Both firms are in the 34 percent tax bracket. ...

*December 3, 2009 by pattikake1959*

**Stats**

The amount of time Ricardo spends brushing his teeth follows a Normal Distribution with unknown mean and standard deviation. Ricardo spends less than one minute brushing his teeth about 40% of the time. He spends more than two minutes brushing his teeth 2% of the time. Use ...

*October 9, 2008 by Ann*

**Math**

A friend claims that the average length of trout caught in this lake is 19 inches. To test this claim we find that a sample of 13 trout has a mean length of 18.1 inches with a sample standard deviation of 3.3 inches. The population standard deviation is unknown. If you assume ...

*December 22, 2012 by Alison*

**Statistics**

What is the mean and standard deviation of 63.7%? What is the mean and standard deviation of 61.4%? Using the 68-95-99.7 rule, describe the sampling distribution of 63.7% Using the 68-95-99.7 rule, describe the sampling distribution of 61.4%? Please help I am so lost...

*October 16, 2013 by Lisa*

**Statistics**

What is the mean and standard deviation of 63.7%? What is the mean and standard deviation of 61.4%? Using the 68-95-99.7 rule, describe the sampling distribution of 63.7% Using the 68-95-99.7 rule, describe the sampling distribution of 61.4%? Please help I am so lost...

*October 17, 2013 by Lisa*

**Maths **

1a) for an organic dairy cow, shortly after calving, assume that the amount of milk produced follows a normal distribution with a mean of 27 litres of milk per day and a standard deviation of 4 litres of milk per day. i) calculate the probability that an organic dairy cow will...

*March 3, 2016 by Anonymous*

**Maths**

If the value of a machine depreciates 15percent every year.What was its value 1 year ago.its present value is 85000

*July 13, 2016 by Himanshi*

**Business Statistics**

The U.S. Dairy Industry wants to estimate the mean yearly milk consumption. A sample of 16 people reveals the mean yearly consumption to be 60 gallons with a standard deviation of 20 gallons. a. What is the value of the population mean? What is the best estimate of this value...

*July 28, 2013 by Jan*

**statistics**

f someone scored two Standard Deviations above the Mean on a standardized test where the Mean = 100 and the Standard Deviation = 15, then that person’s numerical score would be…? A. 125 B. 130 C. 160 D. 90th Percentile

*February 20, 2012 by Annie*

**algebra 2**

The time it takes for climbers to reach the highest point of a mountain is normally distributed with a standard deviation of 0.75 hours. If a sample of 35 people is drawn randomly from the population, what would be the standard error of the mean of the sample?

*May 21, 2014 by bc*

**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*

**Stats**

National Packing Materials Company claims its X20 box can hold loads up to at least 80 pounds. Smith Widget Company has been using the boxes for one year and feels the boxes fail at lighter loads. Hearing the complaints from Smith, the lead engineer for National Packaging ...

*September 14, 2008 by Arthur*

**Managerial Accounting**

Doughboy Bakery would like to buy a new machine for putting icing and other toppings on pastries. These are now put on by hand. The machine that the bakery is considering costs $78,000 new. It would last the bakery for ten years but would require a $9,000 overhaul at the end ...

*August 1, 2015 by Kat*

**accounting**

Discuss how the net promoter score is calculated. Show an example of a calculation of a net promoter score (use the data below). What does this score mean specifically in this example? Discuss how the net promoter score can assist in the value of a company. Discuss at least ...

*May 18, 2013 by Denise*

**Statistics**

A driving machine was employed to hit a sample of 41 each of two different brands of golf balls using the same force each time. The research team measured the distance between the point of impact and where the ball eventually came to rest on the ground. Results are show below...

*June 21, 2010 by Randi*

**Statistics**

The lifetime of a certain smart phone battery has an unknown distribution with mean value of 8 hours and standard deviation of 2 hours. What is the approximate probability that the average battery lifetime of a sample of 36 batteries will exceed 8.1 hours?

*December 12, 2011 by jacob*

**Statistics**

The lifetime of a certain smart phone battery has an unknown distribution with mean value of 8 hours and standard deviation of 2 hours. What is the approximate probability that the average battery lifetime of a sample of 36 batteries will exceed 8.1 hours?

*December 12, 2011 by jacob*

**stats**

To test the hypothesis H0 : ì = 100 against H1 : ì > 100, a statistics practioner randomly sampled T observations and found the mean x = 106 and the standard deviation sx = 35. The value of the test statistic is equal to (1) 1.1743 (2) −1.7143 (3) 0.1714 (4) 17.143...

*March 31, 2010 by sam*

**stats 2**

3. Piyush, who had joined the infrastructure department of the bank, was asked to estimate the rental value of commercial property at Ranchi, for the purpose of identifying suitable premises for locating a new branch. Piyush assessed the standard deviation of the value of the ...

*March 29, 2011 by prakash*

**statistics**

I.use the chebyshev's theorem to find out what percentage of the values will fall between 201 and 257 for a data set with a mean of 229 and standard deviation of 14. II. use the emperical rule to find out two values 68% of the data will fall between for a data set with a mean ...

*October 11, 2010 by mary*

**Math**

On a test whose distribution is approximately normal with a mean of 50 and a standard deviation of 10, the results for three students were reported as follows: Student Opie has a T-score of 60. Student Paul has a z-score of -1.00. Student Quincy has a z-score of +2.00. Obtain ...

*January 2, 2011 by Kathy*

**Stasistic**

On a test whose distribution is approximately normal with a mean of 50 and a standard deviation of 10, the results for three students were reported as follows: Student Opie has a T-score of 60. Student Paul has a z-score of -1.00. Student Quincy has a z-score of +2.00. Obtain ...

*June 20, 2011 by Ramona*

**Statistics**

I took a large sample of households in a city, and based on that, estimate the standard deviation of the income for all households in the city is $800. In order to make a desired conclusion about the income for all the households in the city, I want the sample mean for another...

*February 24, 2015 by Macy*

**Statistics and Probability**

I took a large sample of households in a city, and based on that, estimate the standard deviation of the income for all households in the city is $800. In order to make a desired conclusion about the income for all the households in the city, I want the sample mean for another...

*February 24, 2015 by Macy*

**Maths**

Lower quartile=39, Upper quartile=63. Measurements of wind speed on a certain island were taken over a period of one year. A box-andwhisker plot of the data obtained is displayed above, and the values of the quartiles are as shown. It is suggested that wind speed can be ...

*September 30, 2012 by Pipipapoo*

**fiance**

Sonny owns $5,000 worth of High Risk Enterprises (HRE) stock. HRE has a standard deviation of 16 percent and a beta of 2.0. He wants to invest another $5,000 and create a $10,000 portfolio that is equally as risky as the overall market. Which one of the following will ...

*October 26, 2009 by brandon*

**Math**

Sonny owns $5,000 worth of High Risk Enterprises (HRE) stock. HRE has a standard deviation of 16 percent and a beta of 2.0. He wants to invest another $5,000 and create a $10,000 portfolio that is equally as risky as the overall market. Which one of the following will ...

*October 26, 2009 by brandon*

**Investing**

Sonny owns $5,000 worth of High Risk Enterprises (HRE) stock. HRE has a standard deviation of 16 percent and a beta of 2.0. He wants to invest another $5,000 and create a $10,000 portfolio that is equally as risky as the overall market. Which one of the following will ...

*October 26, 2009 by brandon*

**Chemistry**

The cell diagram for the lead-acid cell that is used in automobile and truck batteries is Pb(s) l PbSO4 (s) l H2SO4 (aq) l PbO2(s), PbSO4(s) l Pb (s) where the comma between PbO2 (s) and PbSO4 (s) denotes a heterogeneous mixture of the two solids and the right-hand lead ...

*February 23, 2014 by Bridget*

**finance**

What is the net present value of a project that has an upfront cash outlay of $30,000, and generates cash inflows of $15,000 in year 1, $20,000 in year 2, and $25,000 in year 3 assuming that the company’s cost of capital is 15% per year?

*May 20, 2011 by cynthia*

**Chemistry**

For the reaction, 2SO2(g) + O2(g) ¨ 2SO3(g) + heat, at equilibrium, what will be the effect on the net amount of SO3 present if the temperature of the container is increased? A) The concentration of SO3 decreases. B) The concentration of SO3 increases. C) The concentration ...

*March 12, 2010 by Natalie*

**Statistics homework distribution problem? **

i need help with how to solve this: consider a normal distribution with mean 30 and standard deviation 2. what is the probability a value selected at random from this distribution is greater than 30? the book gives me the answer but i need to know how to solve it. please help?

*February 20, 2012 by jess*

**statistics**

. For patients with a certain disease the amount of certain protein in the blood is normally distributed with a mean of 130 and a standard deviation of 5. For patients without the disease the amount of that protein is normally distributed with a mean of 150 and a standard ...

*October 29, 2014 by Anonymous*

**statistics**

For patients with a certain disease the amount of certain protein in the blood is normally distributed with a mean of 130 and a standard deviation of 5. For patients without the disease the amount of that protein is normally distributed with a mean of 150 and a standard ...

*October 30, 2014 by Anonymous*

**finance**

Nucore Company is thinking of purchasing a new candy-wrapping machine at a cost of $370,000. The machine should save the company approximately $70,000 in operating costs per year over its estimated useful life of 10 years. The salvage value at the end of 10 years is expected ...

*September 25, 2007 by neil*

**Statistics**

A school psychologist decided to separate some classes by gender to see if learning improved. She looked at studded scores on the final exam and obtained the following information: Students in boy-girl classrooms obtained an average of 71.4 on their final exams with a standard...

*April 11, 2015 by Anonymous*

**Math**

Compare the results of the present value of a $6,000 ordinary annuity at 10 percent interest for ten years with the present value of a $6,000 annuity due at 10 percent interest for eleven years. Explain the difference.

*August 3, 2013 by April*

**statistics**

1. A random sample of 100 computers showed a mean of 115 gigabytes used with a standard deviation of 20 gigabytes. What is the standard error of the mean?

*June 18, 2012 by tristen*

**algebra**

On his midterm exam, Jimmy scored 75 points, which was exactly 2 standard deviations above the mean. If the standard deviation for the test is 4, what is the mean for the test?

*October 29, 2013 by Diandra*

**statistics**

The distribution score for a city wide math test scores results in a mean of 70 and a standard deviation of 12. What score is 2 standard deviations above the mean?

*September 30, 2011 by Anonymous*

**Maths**

If I have the mean and standard deviation of data how do I work out the percentage of data within 1,2,and 3 standard deviations of the mean? :) any help would be much appreciated thanks

*October 22, 2011 by Zani*

**chemistry**

Why are standard KMnO4 solutions are seldom used for the titrations of solutions containing HCl? 2. Why are standard solutions of reductants less often for titrations than standard solutions of oxidants? 3. When a solution of KMnO4 was left standing in a buret for 3 hours, a ...

*May 13, 2009 by angel*

**Statistics**

The height of a tree will be measured using a clinometer. For this device, the measurement error has a normal distribution with mean μ=0.00 meter and standard deviation σ=0.05. If the tree is exactly 30 meters tall, what is the probability that the clinometer will ...

*October 19, 2015 by Emily*

**algebra**

Find the future value, using the future value formula and a calculator. (Round your answer to the nearest cent.) $990 at 5.5% compounded quarterly for 3 years Find the present value, using the present value formula and a calculator. (Round your answer to the nearest cent.) ...

*May 12, 2014 by gary*

**statistics**

Computer Services wants to estimate the mean number of hours college students use on campus computers each day. They want to be within .1 hour of the true value with 99% confidence. From a previous study, the standard deviation is assumed to be .6 hour. What size sample is ...

*December 11, 2010 by John Davis*

**Statistics**

Let's pretend the Work variable is normally distributed, with a mean/median/mode value of 22 and a standard deviation of 17. Based on these numbers, we can say that approximately 50 percent of SOC 390 students work more than ____ hours per week (round answer to the nearest ...

*September 8, 2014 by Chris*

**Statstics**

Let's pretend the Work variable is normally distributed, with a mean/median/mode value of 22 and a standard deviation of 17. Based on these numbers, we can say that approximately 50 percent of SOC 390 students work more than ____ hours per week (round answer to the nearest ...

*September 9, 2014 by Chris*

**statistics**

It is well known that the heights of individual American men are normally distributed with mean 70 inches and standard deviation 2.8 inches. The Central Limit Theorem states that if n men are randomly chosen, then their average height will also be normally distributed with ...

*February 13, 2011 by LISA*

**stats **

Relatively speaking, which statistics exam did you do better on? On your first statistics exam you scored a 72 and on the second exam you scored an 89. Hey, you’re improving! Or are you? On the first exam, the class mean was 71 with a standard deviation of 15. On the second...

*February 5, 2013 by kelly*

**Math**

A carnival game consists of rolling a single fair die, with the following results: you win $8 for a 6, $7 for a 5, and lose $3 for any other number. Set a probability distribution, and calculate (already did) the Expected value = .50 Variance= 24.58 standard deviation= 4.96 ...

*December 13, 2007 by Anastasia*

**Statistics**

1. The sociologist surveyed the households in a small town. The random variable X represents the number of dependent children in the households. The following is the probability distribution of X: X 0 1 2 3 4 P(X) 0.07 0.20 0.38 k 0.13 (a) Find the missing probability value of...

*June 1, 2011 by LadyJustice85*

**business statistics**

1. The average life expectancy of people around the world is 71.30 years with a population standard deviation of 8.00 years. I take a sample of 50 countries now and find that the average life expectancy is 74.37 years. Suppose I’m interested in seeing if there has been a ...

*November 7, 2016 by amanda*

**Stats**

A study found that for adults the general self-efficacy scale mean score was 35 and standard deviation was 12. A group of clients (n=14) was measured for their general self-efficacy with the same measure and found having 40 with standard deviation of 20. A group of therapist ...

*August 17, 2013 by Mark*

**statistics**

The purchasing department has suggested that all new computer monitors for your company should be a new design. You want data to assure you that employees will like the new monitors. The next 20 employees needing a new computer are the subjects for an experiment. (a) Label the...

*November 2, 2012 by appy*

**physics**

How long would our year be if our Sun were two fifths its present mass and the radius of the Earth’s orbit were six times its present value?

*May 6, 2010 by erin*

**Math (statistics)**

The probability of obtaining heads on a biased coin is 0.4. The coin is tossed 600 times. a. i. Write down the mean number of heads (240) ii. Find the standard deviation of the number of heads (12) b. Find the probability that the number of heads obtained is less than one ...

*March 16, 2016 by Myra*

**Statistics**

In recording the self-reported lengths of a particular body part in a sample of male undergraduates, the largest was claimed to be 20 cm—a full 3 standard deviations from the mean length for the sample. The shortest alleged length was only 10 cm, which was equivalent to ...

*November 3, 2012 by susan*

**statistics**

say that you have a distribution of exam scores with a mean of 57 and a standard deviation of 7. if a student in the class has a standard score equal to 2.429, what would their raw score on the exam be?

*December 2, 2012 by Dawn*

**Statistics**

You are wondering whether male or female students pay more for books and materials at the U of C. You find 5 male friends at the U of C and find that they spent an average of $680 with a standard deviation of $5. You find 4 female friends at the U of C and find that they spent...

*December 2, 2012 by Susan*

**Finance**

Suppose you just inherited a gold mine. This gold mine is believed to have three years worth of gold deposit. Here is how much income this gold mine is projected to bring you each year for the next three years: Year 1: $49,000,000 Year 2: $61,000,000 Year 3: $85,000,000 ...

*November 13, 2011 by Lamarr*

**Operations management**

An appliance manufacturer wants to contract with a repair shop to handle authorized repairs. The company has an acceptable range of repair time from 50 minutes to 90 minutes. Two firms have submitted bids for the work. In the evaluation trail, one firm had a mean repair time ...

*February 13, 2012 by Ashley*

**Statistics**

The law of large numbers tells us what happens in the long run. Like many games of chance, the numbers racket has outcomes so variable - one three-digit number wins $600 and all others win nothing - that gamblers never reach "the long run." Even after many bets, their average ...

*February 25, 2014 by Ray*

**Statistics**

The law of large numbers tells us what happens in the long run. Like many games of chance, the numbers racket has outcomes so variable - one three-digit number wins $600 and all others win nothing - that gamblers never reach "the long run." Even after many bets, their average ...

*February 25, 2014 by Ray*

**Statistics**

The law of large numbers tells us what happens in the long run. Like many games of chance, the numbers racket has outcomes so variable - one three-digit number wins $600 and all others win nothing - that gamblers never reach "the long run." Even after many bets, their average ...

*February 25, 2014 by PLEASE HELP!!!!!!!!!*

**statistics**

show that in the binomial distribution (q+p)^n the ratio of the mean deviation about about the mean to standard deviation is 2/(npq)^0.5*n-1 cµ-1p^µ-1 q^n-µ where µ is the greatest integer contained in np+1 . find the limits of the above ratio as n tends to infinity.

*January 10, 2012 by urmila*

**STATISTICS**

Can someone please tell me how to solve this problem? A buyer for a lumber company must determine wheter to buy a piece of land containing 50,000 trees. if 2000 tress are at least 48 feet tall she will purchase the land; otherwise she will not. the owner of the land reports ...

*April 20, 2007 by DEE-DEE*

**Statistics**

How do I find the deviation of each x-value from the expected value of 0.97? The chart looks like this... x P(x) x-u 0 0.24 ? 1 0.55 ? 2 0.21 ?

*October 6, 2013 by Lisa*

**Statistics**

In testing a new drug, researchers found that 20% of all patients using it will have a mild side effect. A random sample of 25 patients using the drug is selected. Find the mean and standard deviation of patients having a mild side effect. Mean = np = 25(.2) = 5 Ok Standard ...

*March 11, 2016 by Ray *

**statistics**

The actual weights of bag of pet food are normally distributed.The mean of the weights is 50.0 lb,with a standard deviation of 0.2 lb. C)In a group of 50 bags,how many would yu expect to be within 1.5 standard deviations of the mean?

*June 4, 2012 by Anonymous*

**Math**

Question An investor puts $15,000 into each of four stocks, labeled A, B, C, and D. The table shown below contains the means and standard deviations of the annual returns of these four stocks. Stock Mean Annual Return Standard Deviation of Annual Return A 0.15 0.05 B 0.18 0.07...

*October 15, 2013 by Kessy*

**math**

lilly made a 75 on her history test and an3 on her math test. the mean grade on the history test was 72 with a standard deviation of 5. the average grade on the math test was 81 with a standard deviation of 4. which test did lilly do better?

*May 21, 2015 by debbie*

**bus/stats**

a sample of the personal files of eight male employees revealed that, during a six-month period, they lost the following number of days due to illness: 2,0,6,3,10,4,1 and 2. Calculate the standard deviation of the above sample? the means deviation is 2.375? but not sure how to...

*September 3, 2011 by tim*

**statistics**

Prep Courses? Scores for men (nationwide) on the verbal portion of the SAT test are normally distributed with a mean of 509 and a standard deviation of 112. Randomly selected men are given the Columbia review course before taking the SAT test. After the course, a sample of 49 ...

*June 28, 2010 by STatistic*

**Stat/trig question, please help me, thanks**

In 1995, more than 1.1 million students in the U.S. took the SAT. On the mathematics section, the mean =507, s=112 (standard deviation). Students receive scores rounded to the nearest 10. What is the interval of student scores that lie within one standard deviation of the mean...

*September 5, 2006 by christine*

**statistics**

Farmer Max, sells grain to Germany, owns 60 acres of wheat fields. Based on the past experience, he knows that the yield from each individual acre is normally distributed with mean 120 bushels and standard deviation 12 bushels. Help Farmer Max plan for his next year crop by ...

*November 23, 2014 by loh*

**statistics**

dole pineapple inc. is concerned that the 16 ounce cans are overfilled. assume the standard deviation is .03 onces. a random sample of 50 cans has a mean weight of 16.05 ounces. at the 5% level of significance can we conclude that the mean weight is > than 16 ounces. what ...

*April 2, 2012 by dimitra*

**Co-operate Finance**

As the investment analyst for King breweries you are required to analyze the automated loom system in the Castle larger production line. The old system was purchased 5 years ago for $200,000. It falls in the accelerated cost recovery 5 year class and it has 5 years of ...

*March 24, 2015 by Patricia*

**Physics**

ok I'll be using a home work problem to ask the question. I'm not asking for help on the question I got the correct answer just need to understand this concept better. Calculate the acceelration due to gravity on the Moon. The moon's radius is about 1.74 E 6 meters and its ...

*September 12, 2009 by QUESTION*

**Finance**

differences between present value and future in time value

*November 10, 2009 by soomal*

**Math**

3.22 Defective rate. A machine that produces a special type of transistor (a component of computers) has a 2% defective rate. The production is considered a random process where each transistor is independent of the others. (a) What is the probability that the 10th transistor ...

*February 11, 2016 by Anonymous*

**statistics**

Suppose that the population standard deviation (ó) for a normally distributed standardized achievement test (ACT) is 6. What would the standard error of the sample mean (óxbar) be if we were to draw a random sample of 36 test scores?

*October 4, 2011 by Anonymous*

**Statistic **

The mean SAT score for 13 male high school students is 500 and the standard deviation is 100. The mean SAT score for 16 female high school students is 490 and the standard deviation is 80. At o=.05 sigma sign are male SAT scores more varied than female? (Sigma=.05)

*February 10, 2016 by Dhelp*

**statistics**

An investment broker reports that the yearly returns on common stocks are approximately normally distributed with a mean return of 12.4 percent and a standard deviation of 20.6 percent. On the other hand, the firm reports that the yearly returns on tax-free municipal bonds are...

*February 19, 2012 by Anonymous*

**statistics**

Suppose that the percentage returns for a given year for all stocks listed on the New York Stock Exchange are approximately normally distributed with a mean of 12.4 percent and a standard deviation of 20.6 percent. Consider drawing a random sample of n= 5 stocks from the ...

*August 31, 2009 by Amy*

**Statistics**

Suppose that the percentage returns for a given year for all stocks listed on the New York Stock Exchange are approximately normally distributed with a mean of 12.4 percent and a standard deviation of 20.6 percent. Consider drawing a random sample of n= 5 stocks from the ...

*June 7, 2010 by Mary*

**Statistics**

Suppose that two different tests A and B are to be given to a student chosen at random from a certain population. Suppose also that the mean score on test A is 85, and the standard deviation is 10; the mean score on test B is 90, and the standard deviation is 16; the scores on...

*February 16, 2011 by Charles*

**statistics**

A widget factory's worker productivity is normally distributed. one worker produces an average of 75 widgets per day with a standard deviation of 20. another worker produces at an average rate of 65 per day with standard deviation of 21. 1)what is the probability that in any ...

*April 29, 2012 by Anonymous*

**statistics**

Suppose that the percentage returns for a given year for all stocks listed on the new york stock exchange are approximately normally distributed with a mean of 12.4 percent and a standard deviation of 20.6 percent. Consider drawing a random sample of n=5 stocks from the ...

*November 9, 2009 by ileana*

**chemistry**

A scientist measures the standard enthalpy change for the following reaction to be -172.4 kJ : 2SO2(g) + O2(g) 2SO3(g) Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of SO2(g) is what in kJ/mol?

*March 7, 2015 by jojo*

**statistics**

Use the Standard Normal Distribution table to find the indicated area under the standard normal curve. Q1: Between z = 0 and z = 2.24 A1: 0 = 0.5000 2.24 = 0.9875 0.9875 – 0.5000 = 0.4875 Q2:To the left of z = 1.09 A2: 0.8621 Q3: Between z = -1.15 and z = -0.56 A3: -1.15 = 0...

*March 27, 2010 by looking for someone to varify my work please*

**Stats**

The director of admissions at Kinzua University in Nova Scotia estimated the distribution of student admissions for the fall semester on the basis of past experience. Admissions Probability 1,080 0.5 1,340 0.2 1,660 0.3...

*September 28, 2010 by Nicole *

**math **

1.find the mean,variance and standard deviation for the number of heads when 10 coins are tossed. 2.it has been reported that 83% of government employees has been migrated onto the single-spin salary structure.if a sample of 200 government employees is selected,find the mean ...

*April 2, 2016 by farahan*