Thursday

April 24, 2014

April 24, 2014

Number of results: 15,881

**stats**

Suppose the mass of college students can be modeled by the normal distribution. We believe the mean of the normal distribution is 72 kg. We randomly sample 18 students and find an average of 69 kg and a standard deviation of 4kg. A. The standard error of x is 0.9428 B. A t-...
*Wednesday, March 31, 2010 at 1:24pm by judy*

**Stats**

Dee's store monthly sales for April, May, June are three independent random variables with means and variances as follow: April: Mean: $9500 Variance: $1250 May: Mean: $7400 Variance: $1425 June: Mean: $8600 Variance: $1610 a) find the mean and standard deviation of the total ...
*Sunday, October 29, 2006 at 8:49pm by Dee*

**chemistry**

Why doesn't potassium ion K+ from KMnO4 appear in the following two unbalanced equations: MnO4 + C2O42 Mn2+ + CO2 MnO4 + Fe2+ Mn2+ + Fe3+ ? A. KMnO4 is not added to either reaction. B. The presence of K+ would result in a net positive charge in the products. C. K+ is a ...
*Sunday, April 27, 2008 at 11:37pm by Renee*

**chemistry**

Why doesn't potassium ion K+ from KMnO4 appear in the following two unbalanced equations: MnO4 + C2O42 Mn2+ + CO2 MnO4 + Fe2+ Mn2+ + Fe3+ ? A. The presence of K+ would result in a net positive charge in the products. B. The equations cannot be balanced if the potassium ion...
*Sunday, April 26, 2009 at 4:09am by uci student*

**Chemistry**

Why doesn't potassium ion K+ from KMnO4 appear in the following two unbalanced equations: MnO4 + C2O42 Mn2+ + CO2 MnO4 + Fe2+ Mn2+ + Fe3+ ? A. KMnO4 is not added to either reaction. B. K+ is a spectator ion and redox reactions are written as net ionic reactions. C. The ...
*Sunday, April 25, 2010 at 4:22pm by John*

**Business Communications**

Which of the following statements about how the standard pattern for informative and positive messages should be applied is essential? Use all five of the elements of the basic organizational pattern. Present each element in a separate paragraph of its own. Present the ...
*Friday, November 5, 2010 at 3:19pm by lisa*

**algebra 11**

a normal distribution has a mean of 22 and a standard deviation of 3. Find the probablility that a randomly selected x-value is in the given interval. Between 19 and 25.
*Monday, January 31, 2011 at 1:08pm by alysha*

**Stats**

identify what is the 95 percent confidence interval for upper class respondents, give you have known their mean=15.34, standard deviation=3.48,and cases=38
*Monday, April 4, 2011 at 8:18pm by Nancy*

**statistics**

Let x be a continuous random variable that is normally distributed with a mean of 65 and a standard deviation of 15. Find the probability that x assumes a value less than 44.
*Monday, April 18, 2011 at 9:01pm by Katie*

**statistics**

Let x be a continuous random variable that is normally distributed with a mean of 65 and a standard deviation of 15. Find the probability that x assumes a value less than 45.
*Monday, April 18, 2011 at 9:02pm by Katie*

**statistics**

In a population of normally distributed aptitude scores of 1000 academy students with mean 70 and Standard deviation 10, how many score above 95?
*Tuesday, May 10, 2011 at 10:21pm by Lisa*

**statistics**

A population of scores forms a normal distribution with a mean of = 40 and a standard deviation of SD = 12. a. What is the probability of randomly selecting a score less than X = 34?
*Friday, June 3, 2011 at 2:55pm by Anonymous*

**Math**

An unfair coin with Pr[H]=0.25 is flipped 95 times. A random variable X is defined as the number of heads that occur. Find the standard deviation. Any help??
*Monday, April 2, 2012 at 5:05pm by Tiffany*

**statistics**

a company manufactures batteries in batches of 18 and there is a 3% defect rate. Find the standard deviation for a number of defects per batch?
*Saturday, May 12, 2012 at 8:46pm by tara*

**stats**

A set of LSAT scores follows the normal curve. The average is 560, and the standard deviation is 60. Find the 80th percentile.
*Saturday, July 7, 2012 at 6:35pm by sheri*

**statistics**

The mean of a normal probability distribution is 100 and the standard deviation is 8. About what percent of the observations lie between 84 and 116?
*Tuesday, September 4, 2012 at 2:45pm by sara*

**statistics**

Let x be a continuous random variable that is normally distributed with a mean of 65 and a standard deviation of 15. Find the probability that x assumes a value less than 44.
*Wednesday, October 31, 2012 at 10:05pm by Anonymous*

**statistics**

Find the standard deviation, Sigma, for the binomial distribution which has the stated values of n and p. Round your answer to the nearest hundredth. n = 639; p = 0.7
*Sunday, April 14, 2013 at 2:19pm by todd*

**statistics**

a quiz consists of 30 true or false questions. if the student guesses on each question, what is the standard deviation of the number of correct answers
*Monday, April 29, 2013 at 7:15pm by mike*

**statistics**

The same calculus exam has a normal distribution with a mean of 76 and a standard deviation of 6. Find the percentage of students that scored between 65 and 90.
*Thursday, July 11, 2013 at 5:25pm by Anonymous*

**math**

on a mathematics test in high school, scores are normally distributed with a mean of 77 and a standard deviation of 16.8. A students is randomly selected.
*Saturday, February 1, 2014 at 8:47pm by Anonymous*

**statistics**

a research participant has her brain scanned while listening to music and solving math problems, and the brain area of interest has a percent signal change of 58. From many previous studies with this same math-problems procedure (but not listening to music), it is known that ...
*Friday, January 13, 2012 at 11:47pm by Anonymous*

**stats**

if you randomly answer a t/f test and want to figure the possibililty of gettng at least an 80......how do you start and then once you have done this, what if you want to try it 4 more times? HELP Let N be the number of questions. You are asking for the probability of getting ...
*Thursday, July 5, 2007 at 5:17pm by holly*

**Statistics**

In the library on a university campus, there is a sign in the elevator that indicates a limit of 16 people. in addition there is a weight limit of 2500 lbs. assume that the average weight of students, faculty, and staff on campus is 150 lbs, that the standard deviation is 27 ...
*Sunday, June 2, 2013 at 2:22pm by Eric*

**Statistics**

In the library on a university campus, there is a sign in the elevator that indicates a limit of 16 people. in addition there is a weight limit of 2500 lbs. assume that the average weight of students, faculty, and staff on campus is 150 lbs, that the standard deviation is 27 ...
*Sunday, June 2, 2013 at 9:25pm by Eric*

**statistics**

MacDonalds executives want to experiment with redesigning its restaurants so that the customers form one line leading to four registers, rather than four lines leading to four separate registers. They redesign 30 randomly selected restaurants with the single line. In addition...
*Monday, April 12, 2010 at 12:19pm by britt*

**Fin301 Economics**

How do I figure out Capital Budgeting in easy to understand terms. Example Cashflow is -$500,000 and the discount rate is 0%, what is the projects net present value?
*Monday, September 3, 2007 at 9:37am by Randy*

**business statistics**

For one of the tasks in a manufacturing process, the mean time for task completion has historically been 35.0 minutes, with a standard deviation of 2.5 minutes. Workers have recently complained that the machinery used in the task is wearing out and slowing down. In response to...
*Wednesday, July 29, 2009 at 4:43pm by Maliza*

**business(Information Systems Strategy)**

Strategy Development Present and explain five key IT/IS initiatives that should form companys (mobile industry company) 3-5 year IT/IS strategy. You should present this strategy using Earls Risk & Return Portfolios taxonomy, then by briefly explaining / justifying each of ...
*Monday, October 27, 2008 at 11:17am by Shalini*

**physics**

A toy car is given a quick push so that it moves on an inclined ramp. After it is released, it moves up, reaches its highest point and moves back down again. Friction is so small it can be ignored. What net force acts on the car? A. net force of zero B. Net constant force up ...
*Saturday, July 2, 2011 at 1:54pm by alexa*

**statistics**

A sample of 148 of our statistics students rated their level of admiration for Hillary Rodham Clinton on a scale of 1 to 7. The mean rating was 4.06, and the standard deviation was 1.70. (For this exercise, treat this sample as the entire population of interest.) a. Use these ...
*Monday, October 14, 2013 at 12:43pm by eid2013*

**stats**

The standard deviations s for the annual medical costs 30 heart disease patients was found to equal $1005. Find a 95 % confidence interval for the standard deviation of the annual medical costs for all heart disease patients.
*Sunday, March 31, 2013 at 6:43pm by chris*

**Finance**

What's the net present value (NPV) of this replacement project? The old equipment has a book value of $200,000 (year 0) and a current salvage value of $300,000 (year 0). It is being depreciated on a straight-line basis. It has four more years of depreciation left ($50,000 in ...
*Sunday, April 11, 2010 at 11:14pm by Herb*

**Business**

What is the net present value (NPV) of this replacement project? The old equipment has a book value of $200,000 (year 0) and a current salvage value of $300,000 (year 0). It is being depreciated on a straight-line basis. It has four more years of depreciation left ($50,000 in ...
*Sunday, April 11, 2010 at 11:16pm by Herb*

**statistics**

question- a packaging device is set to fill detergent powder packets with a mean weight of 5 kg .the standered deviation is known to be 0.01kg.these are known to drift upward over a period of time due to machine fault,which is not tolerable.a random sample of 100 packets is ...
*Friday, October 29, 2010 at 7:04am by sunil*

**statistics**

How do I sketch distributions? I think I'm doing it wrong. Is there an option my friends stats-calc(her calcultor is very tempremental, so i don't know if it'll work) I can utiilzie that'll sketch things for me? thanks. -Sketch a normal distribution with (mu) m =80 and ...
*Wednesday, January 30, 2008 at 6:27pm by Gloria*

**Statistics**

Sulfur compounds cause "off-odors" in wine, so winemaker want to know the odor threshold, the lowest concentration of a compound that the human nose can detect. The odor threshold for dimethyl sulfide (DMS) in trained wine tasters is about 25 micrograms per liter of wine. The ...
*Sunday, May 6, 2012 at 3:36am by Ryan*

**Statistics**

1. A study of 40 people found that they could do on the average15 pull ups with a standard deviation of .6. Find the 99% confidence interval for the mean of the population. 2. A study of 50 pizza delivery workers found that they could make 6 deliveries per hour with a standard...
*Friday, May 3, 2013 at 11:45am by Cam*

**chemistry(check my asnwer)**

Why doesn't potassium ion K+ from KMnO4 appear in the following two unbalanced equations: MnO4 + C2O42 Mn2+ + CO2 MnO4 + Fe2+ Mn2+ + Fe3+ ? A. KMnO4 is not added to either reaction. B. The presence of K+ would result in a net positive charge in the products. C. The ...
*Saturday, April 17, 2010 at 7:30pm by eng*

**statistics**

A column packing for chromatography consists of a mixture of two types of particles. Assume that the particles in the batch being sampled are spherical with a radius of 0.5 mm. 36% of the particles appeared to be pink and are known to have a polymeric stationary phase attached...
*Sunday, March 28, 2010 at 4:40am by Simon*

**Statistics**

The average age of chemical engineers is 37 years with a standard deviation of 4 years. If an engineering firm employs 25 chemical engineers, find the probability that the average age of the group is greater than 38.2 years old. If this is the case, would it be safe to assume ...
*Sunday, October 17, 2010 at 8:21pm by Anonymous*

**math**

Instant dinner comes in packages with weights that are normally distributed, with a standard deviation of 0.3 oz. If 2.3% of the dinners weigh more than 13.5 oz, what is the mean weight?
*Saturday, November 15, 2008 at 2:11pm by missy*

**statistics**

Number sampled is 1,000 and mean is 7.2 on a scale from 1-10 how do I determine standard deviation. Can we answer this with using the sampling distribution of the sample proportion?
*Saturday, February 13, 2010 at 9:50pm by mark*

**statistics**

what is the standard deviation if 12 randomly chosen students were asked how many times they had missed class during a certain semester with this result 2,1,5,1,1,3,4,3,1,1,5,1,8.
*Tuesday, September 14, 2010 at 11:07pm by clemencia*

**statistics**

the following data lists the average monthly snowfall for jan 15 cities around us: 34 9 28 24 0 46 34 20 1 38 5 16 32 26 25 find the mean, variance, and standard deviation
*Monday, October 11, 2010 at 11:20pm by mary*

**Statistics**

In a random sample of 50, the average is 3987 with a population standard deviation of 630. How can one find the 90% confidence interval of the true mean?
*Tuesday, October 26, 2010 at 9:39am by Tony*

**RES342**

A normal distribution has a mean of 80 and a standard deviation of 14. Compute the probability of a value between 75.0 and 90.0. a) .2022 b) .3595 c) .4017 d) None of the above
*Thursday, December 2, 2010 at 5:55pm by Aimee*

**statistics**

The following data lists the average monthly snowfall for January in 15 cities around the US: 37 33 35 27 9 45 22 8 42 48 37 39 9 15 12 Find the mean, variance, and standard deviation
*Sunday, May 15, 2011 at 7:47pm by kate*

**Statistic**

The following data lists the average monthly snowfall for January in 15 cities around the US: 20 13 15 28 16 25 2 14 35 42 5 34 34 38 29 Find the mean, variance, and standard deviation.
*Friday, September 23, 2011 at 11:59pm by Anonymous*

**Statistics**

The following data lists the average monthly snowfall for January in 15 cities around the US: 29 26 6 46 17 34 15 45 19 43 37 6 9 33 37 Find the mean, variance, and standard deviation.
*Monday, October 17, 2011 at 12:20am by Jennifer*

**Math**

The following data lists the average monthly snowfall for January in 15 cities around the US: 42 45 8 18 45 15 31 46 3 33 2 6 32 47 36 Find the mean, variance, and standard deviation.
*Thursday, November 10, 2011 at 7:39pm by Jennifer*

**statistics**

The mean (μ) of the scale is 98 and the standard deviation (σ) is 13. Assuming that the scores are normally distributed, what is the PROBABILITY that a score falls below 88?
*Tuesday, February 28, 2012 at 9:12pm by Anonymous*

**statistics**

For a sample size of 10 from a population whose standard deviation is not known, which type of probability distribution is used to help calculate a confidence interval for the mean?
*Wednesday, April 11, 2012 at 12:14pm by Anonymous*

**statistics**

If the average number of textbooks in professors offices is 16 with a standard deviation of 5; and the average age of professors is 43 with a standard deviation of 8. Calculate the covariance of the number of textbooks in professors offices (show your work and formulas used) ...
*Thursday, May 10, 2012 at 8:50am by Leannes*

**statistics**

The heights of young women are approximately normal with a mean 64.5 in and a standard deviation of 2.5 in. What is the probability that a woman chosen at random is taller than 63.6 inches?
*Tuesday, August 14, 2012 at 9:51pm by Lynn*

**statistics**

Alice has measured the hemoglobin levels of 200 people. If the data follows a normal distribution with a mean of 10 and a standard deviation of 1, what can you conclude?
*Thursday, August 23, 2012 at 12:53am by Jimb*

**stats.**

All the following are measures of variability or dispersion within a set of data except? range, median, standard deviation, variance
*Saturday, April 13, 2013 at 2:31pm by Linda*

**Math**

For a Normal distribution with mean, mu=2, and standard deviation, sigma = 4, 70% of all observations have values between x and y . (Round to 4 decimal places.)
*Monday, April 15, 2013 at 1:56am by Jackie*

**Math**

The scores on a standardized test are normally distributed with the mean of 750 and standard deviation 70. Find the probability that a score is more than 890.
*Tuesday, May 21, 2013 at 2:50pm by Denise*

**statistics**

comment on this statement "The mean loss for customers at the first State bank (which is not insured) was $150.00 the standard deviation of the losses was -$125.00"
*Friday, June 28, 2013 at 12:22pm by daphne*

**statistics**

A psychologist studied self esteem scores and found the sample data set to be normally distributed with a mean of 50 and a standard deviation of 5?
*Saturday, January 25, 2014 at 7:36pm by Stephanie*

**statistics**

You are conducting an experiment to see if a given therapy works to reduce test anxiety in a sample of college students. A standard measure of test anxiety is known to produce a = 19. In the sample you draw of 86 the mean is equal 17.5 with standard deviation s = 10. a- Use ...
*Friday, January 6, 2012 at 1:03pm by sai*

**Stats.**

An obstetrician maintains that preterm babies (gestation less than 37 weeks) have a higher variability of birth weight than do full-term babies (gestation 37-41 weeks). According to the National Vital Statistics Report, Vol. 48, No. 3, the birth weights of full time babies ...
*Monday, March 28, 2011 at 11:43am by Rob*

**Math**

Score Percentile Score Percentile Score Percentile Score Percentile -3.5 0.02 -1 15.87 0 50 1.1 86.43 -3 0.13 -0.95 17.11 0.05 51.99 1.2 88.49 -2.9 0.19 -0.9 18.41 0.1 53.98 1.3 90.32 -2.8 0.26 -0.85 19.77 0.15 55.96 1.4 91.92 -2.7 0.35 -0.8 21.19 0.2 57.93 1.5 93.32 -2.6 0.47...
*Saturday, May 12, 2012 at 8:59pm by Need Help!!!*

**math**

A sporting goods company has a distribution center that maintains inventory of fishing rods. The fishing rods have the following demand, lead time, and cost characteristics: Average demand = 95 units per day, with a standard deviation of 18 units Average lead time = 14 days ...
*Tuesday, July 17, 2012 at 9:52am by Candace*

**statistics**

. In terms of the mean and standard deviation: - What does it mean to say that a particular value of x has a standard score of +1.5? - What does it mean to say that a particular value of x has a z-score of -2.6? Please show all work.
*Saturday, September 29, 2012 at 8:55am by Anonymous*

**Statistics**

I have a problem I need some help on. I have answered parts. Any guidance would be appreciated. K For many years the numbers of accidents per week at a hazardous intersection have been studied. The number of accidents per week varies with mean 2.2 and standard deveiation 1.4. ...
*Saturday, August 4, 2007 at 12:21am by Kayse*

**Statistics**

In Professor Smith's statistics course, the correlation between students' total scores before the final exam and their final exam scores is r = 0.67. The pre-exam totals for all students in the course have a mean of 275 and a standard deviation of 26. The final exam scores ...
*Sunday, February 1, 2009 at 2:45pm by Jannel*

**Chemistry**

Which of the following is true about the reaction between sodium bromide and silver sulfate? 1. No reaction 2. Total ionic equation is identical to the net ionic equation 3. Sodium ions and sulfate ions are present in the toal ionic equation but not in the net ionic equation 4...
*Wednesday, May 11, 2011 at 2:43am by Gina*

**CHEMISTRY (HELP)**

Which of the following is true about the reaction between sodium bromide and silver sulfate? 1. No reaction 2. Total ionic equation is identical to the net ionic equation 3. Sodium ions and sulfate ions are present in the toal ionic equation but not in the net ionic equation 4...
*Wednesday, May 11, 2011 at 11:20am by Gina*

**Physics **

In a crystal of salt there are electrons and positive ions. How does the net charge of the electrons compare with the net charge of the ions? 1. Unable to determine 2. Sometimes the net charge of the negative electrons is greater than the net charge of the ions and sometimes ...
*Thursday, February 7, 2013 at 2:57pm by Tiffany *

**Math**

Can someone answer a question similar to a and b so I can use as an example. Consider the following binomial random variables. (a) The number of tails seen in 47 tosses of a quarter. (i) Find the mean. (Give your answer correct to one decimal place.) (ii) Find the standard ...
*Saturday, June 1, 2013 at 6:52pm by Nora 512*

**math**

Suppose that people's heights (in centimeters) are normally distributed, with a mean of 170 and a standard deviation of 5. We find the heights of 80 people. (You may need to use the standard normal distribution table. Round your answers to the nearest whole number.) (a) How ...
*Monday, March 17, 2014 at 8:00am by wanda*

**Probability / Statistics**

I was wondering if someone could check my work thanks so the question is like so: The time it takes for a pendulum to complete the one period is simplified by the formula: T=2 pi square root (L/g) Where g is the constant measuring 9.80655m/s^2 and L is the length of the ...
*Sunday, June 10, 2007 at 3:20pm by z score!*

**Statistics**

Please help me figure them out. 1. In the 105th Congress, the Senate consist of 55 Republicans and 45 Democrats. If a committee is formed by randomly selecting four different senators, what is the probability that they're all Republicans? 2. It's common for public opion polls ...
*Tuesday, December 5, 2006 at 3:45pm by David*

**chemistry (electrochemistry)**

1) For the following electrochemical cell Cu(s)|Cu2 (aq, 0.0155 M)||Ag (aq, 1.50 M)|Ag(s) write the net cell equation. Calculate the following values using standard potentials as needed. Eo cell and dGo for each reaction...
*Monday, April 15, 2013 at 11:32am by Andrew*

** government**

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?
*Sunday, November 9, 2008 at 1:35pm by ViVi*

**Statistics**

In a population of 240 women,the heights of the women are normally distributed with a mean of 64.2 inches and a standard deviation of 3.2 inches. If 36 women are selected at random, find the mean mu x and stand deviation sigma x of the population of sample means. Assume that ...
*Tuesday, November 8, 2011 at 12:49pm by Joe*

**Statistics **

Information from the American Institute of Insurance indicates the mean amount of life insurance per household in the United States is $120,000. This distribution follows the normal distribution with a standard deviation of $38,000. (A) If we select a random sample of 58 ...
*Friday, April 11, 2014 at 11:35pm by Student5*

**Statistics**

Some IQ scores are standardized with a mean of 100 and a standard deviation of 16. Using the 68-95-99.7 Rule, Determine: What percent of people would have an IQ score 68 and 84.
*Monday, February 25, 2008 at 8:24am by Math help*

**math**

Instant dinner comes in packages with weights that are normally distributed with a standard deviation of 0.3 oz. If 2.3 percent of the dinners weigh more than 13.5 oz, what is the mean weight?
*Saturday, November 15, 2008 at 5:49pm by missy*

**statistics**

Given that a sample is approximately bell-shaped with a mean of 60 and a standard deviation of 3, the approximate percentage of data values that is expected to fall between 54 and 66 is
*Sunday, August 22, 2010 at 11:28pm by Anonymous*

**statistics**

CALCULATE THE PERCENTAGE OF CASES THAT FALL BETWEEN THE SCORES 120 AND 110 ON A NORMALLY DISTRIBUTED iq TEST WITH A MEAN OF 100 AND A STANDARD DEVIATION OF 10
*Tuesday, November 30, 2010 at 8:02pm by ROXIE*

**statistics**

Let X be a continuous random variable that is normally distributed with mean, = 15 and standard deviation, σ = 2.8, find a value xo that represents the 80th percentile of the distribution.
*Thursday, March 3, 2011 at 5:42pm by Jessie*

**statistics math**

MEAN =10 & STANDARD DEVIATION =2. FIND THE PROBABILITIES: 9.4 X 10.6 i have 2 different answers but am checking the answer. thank you one is 0.6179 the other is 0.2358
*Tuesday, March 8, 2011 at 12:10am by Jeannie *

**topics of math**

A population is normally distributed with mean 43.7 and standard deviation 5.2. Find the following probability. (Round your answer to four decimal places.) p( x > 55.0 )
*Wednesday, April 6, 2011 at 8:06pm by Hannah*

**Statistics**

Given the list 10,7,5,3,-6 find by hand, mean,meadian, midrange, mode(s), range, popvar, and sample standard deviation. (seven problems)
*Saturday, September 10, 2011 at 4:14pm by marie *

**Statistics**

Calculate the mean and standard deviation of the probability distribution created by rolling a dice. Either show work or explain how your answer was calculated.
*Sunday, October 9, 2011 at 1:33pm by Peter*

**statistics**

Forty percent of participants in a soccer league are nine years old, 30% are eight, 20% are seven, and 10% are six. What is the expected value of the age and the standard deviation?
*Sunday, October 9, 2011 at 8:35pm by yogi*

**BUSINESS STATISTICS**

The random variable x is normally distributed with mean =1,000 and standard deviation =100. Sketch and find each of the following probabilities: P(x<1,035)
*Sunday, October 16, 2011 at 10:01pm by Shirley*

**BUSINESS STATISTICS**

The random variable x is normally distributed with mean =1,000 and standard deviation =100. Sketch and find each of the following probabilities: P(x<1,035)
*Tuesday, October 18, 2011 at 6:20am by Shirley*

**statistics**

e Chebyshevs theorem to find what percent of the values will fall between 226 and 340 for a data set with a mean of 283 and standard deviation of 19.
*Sunday, November 13, 2011 at 12:54pm by dee*

**Statistics**

Given that a sample is approximately bell-shaped with a mean of 60 and a standard deviation of 3, the approximate percentage of data values that is expected to fall between 54 and 66 is
*Sunday, January 22, 2012 at 2:32pm by Dawn*

**Stats**

Given that a sample is approximately bell-shaped with a mean of 60 and a standard deviation of 3, the approximate percentage of data values that is expected to fall between 54 and 66 is 75% 95% 68% 99.7%
*Saturday, March 3, 2012 at 8:26pm by Ashley*

**statistics**

if the mean is 250mg and the standard deviation is 75mg and 2% goes either right or left, what formula do i use to come out with a normal curve?
*Sunday, July 15, 2012 at 12:18pm by gracie*

**Statistics**

he life expectancy of a lung cancer patient treated with a new drug is normally distributed with a mean of 4 years and a standard deviation of 10 months
*Sunday, September 30, 2012 at 9:03am by Ty*

**statistics**

"suppose that IQ scores have a bell-shaped distribution with a mean of 97 and standard deviation of 17.Using empirical rule, what percentage of IQ score are less than 46?"
*Sunday, September 8, 2013 at 11:59pm by Tasha*

**ALGBRA**

Consider the following test scores obtained by a class. Test score 90 80 70 60 50 Frequency 1 4 11 6 2 Find the standard deviation (rounded to the nearest hundredth). -------------------------------- I've posted this question earlier and I'm still getting the wrong answer. I ...
*Tuesday, December 4, 2012 at 6:08pm by Debin*

**Math**

Consider the following test scores obtained by a class. Test score 90 80 70 60 50 Frequency 1 4 11 6 2 Find the standard deviation (rounded to the nearest hundredth). -------------------------------- I've posted this question earlier and I'm still getting the wrong answer. I ...
*Tuesday, December 4, 2012 at 9:59pm by Debin*

**math**

weekly take home pay for those 20 graduate teaching assistants from university z: 500.75, 217.43, 488.25, 405.78 485.46, 495.48, 370.75, 435.40 479.65, 482.56, 470.28, 489.90 382.50, 500.75, 465.32, 481.25 506.43, 225.50, 504.38, 179.25 1. what are the mean and standard ...
*Wednesday, April 13, 2011 at 9:47am by mary*

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