Friday

April 18, 2014

April 18, 2014

Number of results: 10,723

**algebra/math**

Suppose that people's heights (in centimeters) are normally distributed, with a mean of 165 and a standard deviation of 6. We find the heights of 40 people. (a) How many would you expect to be between 158 and 172 cm tall?
*Saturday, August 27, 2011 at 6:02am by Anonymous*

**statistics**

1) A scale measuring prejudice has been administered to a large sample of respondents. The distribution of scores is approximately normal with a mean of 31 and a standard deviation of 5. What percentage of sample had scores below 20?
*Tuesday, September 27, 2011 at 10:29pm by Mich*

**Statistics**

Scores on the Stanford-Binet Intelligence scale have a mean of 100 and a standard deviation of 16, and are presumed to be normally distributed. A person who scores 68 on this scale has what percentile rank within the population?
*Monday, October 17, 2011 at 1:31am by Jen*

**statistics **

If only the upper 30% of a normally distributed class passed a quiz for which the mean was 70 and the standard deviation was 10, what was the lowest score a student could have received and still have passed?
*Saturday, February 18, 2012 at 2:36am by Cody Morris*

**Statistics**

Suppose that you have a normally distributed population with unknown μ and standard deviation σ = 20. Given that the probability that a random observation X will fall within the range μ±E is .95 or 95%, find E.
*Thursday, April 26, 2012 at 6:22am by rbcjy*

**Statistics**

On the daily run of an express bus, the average number of passengers is 48. The standard deviation is 3. Assume the variable is normally distributed. Find the probability that the bus will have Between 36 and 40 passengers
*Saturday, September 22, 2012 at 12:58pm by Darryle*

**Statics**

An automotive engineer wants to use 64 test runs to estimate the true mean tire stopping distance. The standard deviation is assumed to be 32 feet. What is the probability that the error of the estimate will be more than 4 feet?
*Sunday, December 2, 2012 at 10:43am by Heather*

**Statistics**

A shoe store knows that the purchase amount by its customers is a random variable that follows a normal distribution with a mean of $30 and a standard deviation of $9. What is the probability that a randomly selected customer will spend $30 or more at this store?
*Thursday, December 27, 2012 at 7:28pm by Anonymous*

**Statistics**

Consider a basketball game where a player throws from the free throw line. Her success rate is 65%. If she throws 10 times in a game determine the following:The mean and standard deviation of this binomial distribution.
*Saturday, March 2, 2013 at 2:39pm by Sue*

**math check**

Consider the following set of data. Pairs 1 2 3 4 5 Sample A 2 8 7 9 2 Sample B 7 8 1 1 8 Find the standard deviation sd of the paired differences. (Give your answer correct to two decimal places.) My answer was 5.00.
*Saturday, June 22, 2013 at 8:40am by Tommy8*

**Statistics**

The weights of male babies less than 2 months old in the United States is normally distributed with a mean of 11.5 pounds and a standard deviation of 2.7 pounds. Find the 80th percentile score for these weights.
*Tuesday, February 25, 2014 at 6:18pm by Jeri Jackson*

**Finite Math**

The purchases made by customers at a convenience store are normally distributed, with a mean of $5.50 and a standard deviation of $3.50. What is the probability that a randomly chosen customer makes a purchase between $2.00 and $9.00?
*Sunday, March 9, 2014 at 3:47pm by Tanisha *

**math**

The mean should be (1/5)*1000 = 200 correct guesses and the standard deviation should be sqrt [p(1-p)N] = sqrt[(1/5)(4/5)1000] = 12.65
*Wednesday, February 6, 2008 at 11:44pm by drwls*

**math**

Hi, How do I find the coefficient of variation? I found the sample variance and the standard deviation for the problem I'm trying to solve, but I can't find the coefficient of the variation
*Sunday, May 3, 2009 at 5:29pm by Stella*

**math**

Hi, How do I find the coefficient of variation? I found the sample variance and the standard deviation for the problem I'm trying to solve, but I can't find the coefficient of the variation
*Sunday, May 3, 2009 at 6:00pm by Stella*

**AP Statistics**

if the probability of a dribbling drummer is .38, find the standard deviation of the dribbling drummers drumming for the twelve drummers drumming
*Wednesday, January 6, 2010 at 9:31pm by Belle*

**statistics**

Scores on an english test are normally distributed with a mean of 33.6 and a standard deviation of 8.3. Find the 41st percentile?
*Monday, November 1, 2010 at 2:57pm by English Test Scores*

**statistics**

Bob scores 610 on his SAT's. If the mean score is 580 and the standard deviation is 115, what percentile is Bob's SAT score?
*Monday, May 21, 2012 at 9:21pm by jordan*

**statistics**

the life of electric bulbs has a normal distribution with a mean of 35 months and a standard deviation of 4 months. What should the warranty period be if the company that manufactures these bulbs does not want to replace more than 2% of the bulbs?
*Monday, December 19, 2011 at 9:34pm by HELPME*

**statistics**

The daily sales of a retail store are normally distributed with a standard deviation of $500. If the probability that sales will be less than $10,000 in any one day is 40%, what are the mean daily sales?
*Tuesday, April 23, 2013 at 10:46pm by Anonymous*

**statistics**

if a toaster ovens hav an average life expectancy of 9.5 years with a standard deviation of 4.75 years. what is the probability that a toaster oven will last twenty years or will fail in one year or less?
*Saturday, September 21, 2013 at 12:36pm by efe*

**statistics**

2. Children’s heights are normally distributed with a mean of 100 cm and a standard deviation of 6 cm. What proportion of children’s heights is smaller than 94?
*Monday, March 7, 2011 at 6:00pm by Marie*

**statistics**

2.Children’s heights are normally distributed with a mean of 100 cm and a standard deviation of 6 cm. What proportion of children’s heights is smaller than 94?
*Monday, March 7, 2011 at 6:00pm by Marie*

**statistics**

In a population of exam scores,a score of X= 48 corresponds to z= 1 and a score of X= 36 corresponds to z= -.50. Find the mean and standard deviation for the population?
*Friday, March 9, 2012 at 3:23pm by Amy*

**statistics**

the lenght of a species of fish is normally distributed with a mean of 24.3 inches and a standard deviation of 1.8 inches. What is the lenght that is exceeded by 30%of these fish
*Tuesday, June 19, 2012 at 4:35pm by Anonymous*

**Statistics **

True or false? If the original x distribution has a relatively small standard deviation, the confidence interval for will be relatively short. Answer True False
*Saturday, July 7, 2012 at 3:54pm by Desperate *

**Math**

On a recent math exam, Alex received a score of 92%. His z-score is positive 2. If the mean for the exam is 84, what is the standard deviation?
*Tuesday, April 16, 2013 at 12:40pm by James Jones*

**prob and stats**

The scores on an Economics examination are normally distributed with a mean of 77 and a standard deviation of 18. If the instructor assigns a grade of A to 16% of the class, what is the lowest score a student may have and still obtain an A? (Give your answer to two decimal ...
*Friday, October 15, 2010 at 1:13am by br0Ok3*

**statistics**

Let x be a continuous random variable that is normally distributed with a mean of 24 and a standard deviation of 7. Find the probability that x assumes a value between 27.5 and 59.0. Use Table IV in Appendix C to compute the probabilities. Round your answer to four decimal ...
*Monday, April 18, 2011 at 9:02pm by Katie*

**Statistics**

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? ..I don't understand how to figure this question out?
*Monday, November 7, 2011 at 1:09pm by mary*

**math**

1. Find the mean first = sum of scores/number of scores Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance. Standard deviation = square root of variance 2-4. Z score = Score ...
*Wednesday, April 13, 2011 at 9:47am by PsyDAG*

**Statistics**

A study found that 8-to 12-year olds spend an average of $18.50 per trip to mall. If a sample of 49 children was used, find the 99% confidence inteval of the mean. Assume the standard deviation is $1.50.
*Thursday, November 20, 2008 at 11:49pm by Anonymous*

**stats**

3. For a particular sample of 50 scores on a psychology exam, the following results were obtained. Mean = 78 Mode = 84 Median = 80 Standard deviation = 11 1. What score was earned by more students than any other score? Why? 2. What is the variance?
*Thursday, September 17, 2009 at 6:34pm by Nina*

**statistics**

A researcher is interested in estimating the noise levels in decibels at area urban hospitals. She wants to be 90% confident that her estimate is correct. If the standard deviation is 4.13, how large a sample is needed to get the desired information to be accurate within 0.68 ...
*Tuesday, November 2, 2010 at 9:02pm by Valerie*

**Math**

Use the 68-95-99.7 rule to solve the problem. - The amount of Jen's monthly phone bill is normally distributed with a mean of $53 and a standard deviation of $11. What percentage of her phone bills are between $20 and $86?
*Saturday, December 11, 2010 at 12:03pm by Deb*

**statistics**

the distribution of heights of American women aged 18 to 24 is approximately normally distributed with mean 65.5 inche and standard deviation 2.5 inches. what is the probability that a randomly seleted woman is between 60 and 64 inches tall?
*Wednesday, June 29, 2011 at 1:42pm by Tee*

**MATH...PLZ HELP**

Given a level of confidence of 99% and a population standard deviation of 13, answer the following: (A) What other information is necessary to find the sample size (n)? (B) Find the Maximum Error of Estimate (E) if n = 61. Show all work.
*Sunday, November 6, 2011 at 10:30pm by Jennifer*

**Math**

Given the following frequency distribution, find the mean, variance, and standard deviation. Class Frequency 31-33 18 34-36 25 37-39 22 40-42 9 43-45 20
*Thursday, November 10, 2011 at 7:39pm by Jennifer*

**statistics**

Science scores for HS seniors in the US are normally distributed with a mean of 77 and a standard deviation of 7. Students scoring in the top 4% are eligible for a special prize. What is the approximate cutoff score a student must get in order to recieve the prize?
*Monday, February 27, 2012 at 1:24pm by taylor*

**statistics**

Science scores for HS seniors in the US are normally distributed with a mean of 77 and a standard deviation of 7. Students scoring in the top 4% are eligible for a special prize. What is the approximate cutoff score a student must get in order to recieve the prize?
*Monday, February 27, 2012 at 1:25pm by taylor*

**statistics**

LSAT test scores are normally distributed with a mean of 510 and a standard deviation of 110. Find the probability that a randomly chosen test-taker will score between 300 and 580. (Round your answer to four decimal places.)
*Wednesday, November 21, 2012 at 12:51pm by Anonymous*

**statistics**

LSAT test scores are normally distributed with a mean of 490 and a standard deviation of 110. Find the probability that a randomly chosen test-taker will score between 320 and 600. (Round your answer to four decimal places.)
*Tuesday, April 16, 2013 at 12:25am by jack*

**BCIT**

A series of standard solutions of benzene in toluene solvent is to be prepared for an internal standard procedure with ethylbenzene serving as the internal standard. Tell how you would prepare the solutions, including the milliliters of benzene concentrations are to be 0.5%, 1...
*Sunday, November 10, 2013 at 5:36am by lori*

**statistics**

A continuously running washing machine receives jolts in a Poisson process at an average rate of 10 jolts per hour. The standard deviation of the number of jolts received in given 20 minute run is equal to
*Monday, March 5, 2012 at 12:03am by Vijay*

**math**

the courier service company has found that their time of parcels to client is normally distributed with a mean of 45 minutes and a standard deviation of 8 minutes. the probability that a randomly selected parcel will take less than 48 minutes to deliver is
*Friday, September 6, 2013 at 10:03am by Anonymous*

**statistics**

In a population of exam scores, a score of X = 48 corresponds to z = +1.00 and a score of X = 36 corresponds to z = -0.50. Find the mean and standard deviation of the population.
*Wednesday, March 17, 2010 at 12:38pm by Teresa*

**Stats**

A loaf of bread is normally distributed with a mean of 22 ounces and a standard deviation of .5 ounces. What is the probability that a loaf of bread is < 20.75
*Tuesday, March 30, 2010 at 6:32pm by Anonymous*

**Statistics**

mean = np = 90 * 1/5 = ? (Note: convert any fractions to decimals.) standard deviation = √npq = √(90 * 1/5 * 4/5) = ? (Note: q = 1 - p) I'll let you take it from here.
*Sunday, March 13, 2011 at 5:49pm by MathGuru*

**math **

the rate of return for an investment can be described by a normal distribution with mean 22% and standard deviation 3%. what is the probability that the rate of return for the investment will be at least 15%?
*Wednesday, April 27, 2011 at 6:49pm by Carola *

**math**

i took the sat and recieved a score of 488 on the math section. the average score was 445 with a standard deviation of 110. where does my score fit in the sample and what is the z score?
*Friday, July 29, 2011 at 12:09pm by patricia*

**Statistics**

mean 26(400) = $10400 Standard deviation = 8(400) = 3200 10400-+ 2.3263*3200/sqrt(50)) [$9,347, 11,453]
*Wednesday, November 13, 2013 at 4:32pm by Kuai *

**science**

i need help with standard deviation and erro bars on graph, if i want to talk about my graph and mention the erro bars and what it means how do i do that?
*Friday, April 16, 2010 at 2:02am by piper*

**statistics**

what is the standard deviation using the rule of thumb for the following set? 57 61 57 57 58 57 61
*Friday, November 25, 2011 at 1:01pm by amy*

**statistics in psychology**

Given a mean of 60, with a standard deviation of 12, and with a raw score of 75, find: (a) the z-score, (b) percentile rank, (c) t-score, (d) SAT score, and (e) stanine score. Discuss why there are so many kinds of standardized scores.
*Thursday, May 12, 2011 at 3:25pm by sharon*

**Math**

Try using the normal distribution tool at http://psych.colorado.edu/~mcclella/java/normal/accurateNormal.html You should get 2.3% of 1000 or 23 for the first question. The range is 2 or more standard deviations frm the mean. Between 520.5 and 547.5, with is + or - 1 one ...
*Saturday, October 9, 2010 at 2:07am by drwls*

**college Math**

Ho: µ = 40 --->meaning the population mean is equal to 40. H1: µ < 40 ---> meaning the population mean is less than 40. This will be a one-tailed test because the alternative hypothesis is showing a specific direction. Use a z-test. Find the significance level for a ...
*Monday, December 7, 2009 at 8:30pm by MathGuru*

**Statistics**

The weight of a product is normally distributed with a standard deviation of .8 ounces. What should the average weight be if the production manager wants no more than 5% of the products to weigh more than 5.3 ounces?
*Wednesday, October 6, 2010 at 3:31pm by Beverley*

**statistics**

If you have a population mean of 50 and a population standard deviation of 5 and you select a sample size of 100, what is the probability that the sample mean is between 47 and 49.5?
*Wednesday, April 27, 2011 at 12:42pm by tom*

**statistics**

Mean = np = (75)(.12) = ? Variance = npq = (75)(.12)(.88) = ? (Note: q = 1 - p) Standard deviation = square root of the variance I'll let you finish the calculations.
*Monday, May 16, 2011 at 5:20pm by MathGuru*

**stats**

The weight of a product is normally distributed with a standard deviation of .8 ounces. What should the average weight be if the production manager wants no more than 1% of the products to weigh more than 7.3 ounces?
*Tuesday, June 14, 2011 at 11:03am by jenny*

**statistics**

Heights of young adult U.S. women are approximately normal with mean 64" and standard deviation 2.7". What proportion of all U.S. young adult women are taller than 6 feet?
*Monday, January 23, 2012 at 9:04pm by Ashley*

**statistics**

IQ scores are normally distributed with a mean u = 100 and a standard deviation o =15. Based on distribution, determine % of IQ scores between 100 and 120 =
*Thursday, June 21, 2012 at 12:47pm by Dianne*

**probability**

assume the readings on thermometers are normally distributed with a mean of 0 C and a standard deviation of 1.00 C. Find the probability P(-2.08<z<2.08), where z is the reading in degrees.
*Monday, November 26, 2012 at 2:47pm by jiji*

**probability**

assume the readings on thermometers are normally distributed with a mean of 0 C and a standard deviation of 1.00 C. Find the probability P(-2.08<z<2.08), where z is the reading in degrees.
*Monday, November 26, 2012 at 3:25pm by jiji*

**statistics**

Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance. Standard deviation = square root of variance
*Friday, February 22, 2013 at 11:47am by PsyDAG*

**Statistics**

Mean = np = (200)(.32) = ? Variance = npq = (200)(.32)(.68) = ? (Note: q = 1 - p) Standard deviation = square root of the variance I'll let you finish the calculations.
*Sunday, March 17, 2013 at 10:22pm by MathGuru*

**statistics**

The weights of individual nails produced by the 'Hammer 'n Nail' hardware company follow a normal distribution with the average nail weight being 5.1 grams and the standard deviation in nail weight being 1.6 grams. When a nail is produced it is discarded if it weighs more than...
*Wednesday, September 29, 2010 at 7:49am by GiNa*

**math**

The diameter of an electric cable is normally distributed, with a mean of 0.8 inch and a standard deviation of 0.01 inch. What is the probability that the diameter will exceed 0.83 inch? (Give the answer to four decimal places.)
*Tuesday, August 30, 2011 at 4:05pm by Anonymous*

**statistics**

Assuming that the weights of newborn babies are normally distributed with mean 6.5 pounds and standard deviation 1.2 pounds, how many babies in a group of 80 do we expect to weigh more than 8.9 pounds? Please show work Thank you
*Tuesday, June 28, 2011 at 12:50pm by Harley*

**math**

The diameter of an electric cable is normally distributed, with a mean of 0.8 inch and a standard deviation of 0.01 inch. What is the probability that the diameter will exceed 0.82 inch? (Give the answer to four decimal places.)
*Wednesday, August 24, 2011 at 8:43pm by apryl*

**alegbra**

The diameter of an electric cable is normally distributed, with a mean of 0.8 inch and a standard deviation of 0.01 inch. What is the probability that the diameter will exceed 0.82 inch? (Give the answer to four decimal places.)
*Saturday, August 27, 2011 at 4:59pm by apryl*

**people**

Suppose that people's heights (in centimeters) are normally distributed, with a mean of 165 and a standard deviation of 6. We find the heights of 80 people. (a) How many would you expect to be between 159 and 171 cm tall?
*Sunday, December 11, 2011 at 11:33pm by Anonymous*

**algebra**

The diameter of an electric cable is normally distributed, with a mean of 0.8 inch and a standard deviation of 0.01 inch. What is the probability that the diameter will exceed 0.81 inch? (Give the answer to four decimal places.)
*Tuesday, February 28, 2012 at 8:11pm by Anonymous*

**math**

The diameter of an electric cable is normally distributed, with a mean of 0.8 inch and a standard deviation of 0.01 inch. What is the probability that the diameter will exceed 0.81 inch? (Give the answer to four decimal places.)
*Tuesday, August 30, 2011 at 4:05pm by mary*

**math**

The diameter of an electric cable is normally distributed, with a mean of 0.8 inch and a standard deviation of 0.01 inch. What is the probability that the diameter will exceed 0.81 inch? (Give the answer to four decimal places.)
*Saturday, June 9, 2012 at 8:31pm by Anonymous*

**math**

The diameter of an electric cable is normally distributed, with a mean of 0.8 inch and a standard deviation of 0.01 inch. What is the probability that the diameter will exceed 0.815 inch? (Give the answer to four decimal places.)
*Tuesday, August 28, 2012 at 12:40pm by Anonymous*

**math**

The diameter of an electric cable is normally distributed, with a mean of 0.8 inch and a standard deviation of 0.01 inch. What is the probability that the diameter will exceed 0.815 inch? (Give the answer to four decimal places.) 1 0
*Wednesday, August 29, 2012 at 5:02pm by Anonymous*

**staticstics**

The average length of an adult blue whate is 30 meters with a standard deviation of 5.7 meters. If a sample of 31 whales is taken, what is the probability that their average lenght differs from the mean by more than 2.0 meters
*Wednesday, October 17, 2012 at 10:27am by melinda*

**staticstics**

The average length of an adult blue whate is 30 meters with a standard deviation of 5.7 meters. If a sample of 31 whales is taken, what is the probability that their average lenght differs from the mean by more than 2.0 meters
*Wednesday, October 17, 2012 at 10:27am by melinda*

**math**

I still disagree. The standard deviation of the sum of N measurements with a normal distribution does not scale with N. As I recall, it scales with the square root of N. That is why I multiplied 5 by the square root of 12. My knowledge of probability theory is a bit rusty, so ...
*Monday, October 8, 2007 at 9:54pm by drwls*

**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*

**Stats**

The average price for new mobile homes is known to be distributed with a standard deviation of 350. if a random rample of 49 homes resulted in a sample mean of 38500, obtain a 90% confidence interval on the population mean.
*Tuesday, March 24, 2009 at 10:50pm by Sally*

**Statistics**

The lifetime of a 2-volt non-rechargeable battery in contant use has a normal distribution with a mean of 516 hours and a standard deviation of 20 hours. Ninety percent of all batteries have a lifetime less than ?
*Wednesday, September 2, 2009 at 3:50pm by Karen*

**Statistics**

The lifetime of a 2-volt non-rechargeable battery in contant use has a normal distribution with a mean of 516 hours and a standard deviation of 20 hours. Ninety percent of all batteries have a lifetime less than ?
*Wednesday, September 2, 2009 at 3:52pm by Karen*

**Stastics**

Bank of Connecticut estimated that balance on credit cards have follows Normal Distribution mean $845 with standard deviation $270. Calculate probability that balance on a single credit card is greater than $750
*Sunday, March 7, 2010 at 2:41pm by Mary *

**statistics**

A researcher randomly selects 37 subjects and administers an attitude test regarding a product. Their mean is 22 and their standard deviation is 2.4. Construct the 90% confidence interval for the mean score of all such subjects
*Wednesday, February 23, 2011 at 7:16pm by mandy*

**Quantitative methods**

the mean and standard deviation of the grades of 500 students who took an maths exam were 69 and 7 respectively. if the grades have a bell shaped distribution, how many of these students received a grade of more than 83 marks?
*Thursday, April 7, 2011 at 11:10am by lisa*

**Quantitative methods**

the mean and standard deviation of the grades of 500 students who took an maths exam were 69 and 7 respectively. if the grades have a bell shaped distribution, how many of these students received a grade of more than 83 marks?
*Thursday, April 7, 2011 at 11:28am by lisa*

**statistics**

Assume that a set of test scores is normally distributed with a mean of 80 and a standard deviation of 25. Use the 68-95-99.7 rule to find the following quantities. The percentage of scores less than 80 is?
*Tuesday, May 24, 2011 at 12:56am by nicole*

**statistics**

Use z-scores. Formula: z = (x - mean)/sd You are looking to solve for x, so fill in the rest of the formula with what you know. Find z using z-table (problem gives you percentage). Mean = 80 and standard deviation = 10. I hope this will help get you started.
*Tuesday, February 21, 2012 at 2:39pm by MathGuru*

**Statistics**

team members estimated that a group of participants spent an average of $90.00 with a standard deviation of $15.00. What is the maximum amount that you can spend and still be in the lowest 20%? and the minimum that you need to be in the highest 15%?
*Friday, March 23, 2012 at 10:01am by Diane*

**statistics**

The average electric bill in a residential area is $72 for the month of May. The standard deviation is $6. If the amounts of electric bills are normally distributed, find the probability that the mean of the bill for 15 residents will be less thatn $75
*Saturday, May 5, 2012 at 9:29am by Bunny*

**Statistics**

Commuters were asked how many times a week they stop for coffee on their way to work. A survey found a mean of 3 times a week with a standard deviation of 0.55. Find the probability that the sum of 121 values is less than 350.
*Monday, December 3, 2012 at 6:41pm by Alley*

**economics**

the average tax charge is $95. Assuming a normal distribution as a standard deviation of $10, use the approximate areas beneath the normal curve to answer what proportion of tax prep fees were exactly $100?
*Saturday, December 15, 2012 at 2:43pm by Anonymous*

**statistics**

The lifetime of a 2-volt non-rechargeable battery in constant use has a normal distribution with a mean of 516 hours and a standard deviation of 20 hours. Ninety percent of all batteries have a lifetime less than
*Friday, May 31, 2013 at 5:29pm by Anonymous*

**Statistics**

1. Let x be the number of heads obtained in two tosses of a coin. The following table lists the probability distribution of x. x 0 1 2 P(x) .25 .50 .25 Calculate the mean and standard deviation of x. Give a brief interpretation of the value of the mean.
*Sunday, June 23, 2013 at 9:49pm by david*

**statistics**

It is claimed the average age of employee in a large company is 50. A sample of 36 employees is taken and the average age was 49. The standard deviation of the population was 5. Use a level of significance of .05. What do you think of this claim?
*Tuesday, July 30, 2013 at 1:51pm by Tom*

**math 115**

Let x be a continuous random variable that follows a normal distribution with a mean of 200 and a standard deviation 25. Find the value of x so that the area under the normal curve between ì and x is approximately 0.4798 and the value of x is greater than ì.
*Tuesday, November 19, 2013 at 10:45pm by louise*

**statistics**

Suppose a random sample of 36 is selected from a population with a standard deviation of 12. If the sample mean is 98, the 99% confidence interval to estimate the population mean is
*Monday, April 25, 2011 at 1:45pm by mona*

**nba stats help!!**

The weight of a product is normally distributed with a standard deviation of .8 ounces. What should the average weight be if the production manager wants no more than 1% of the products to weigh more than 7.3 ounces?
*Wednesday, June 15, 2011 at 4:46pm by jenny*

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