Saturday

October 1, 2016
Number of results: 9,758

**Statistics**

Consider the following. (a) What percentage of a normal distribution is greater than the mean? (Give your answer correct to the nearest percent.) Incorrect: Your answer is incorrect. . % (b) What percentage is within 1 standard deviation of the mean? (Give your answer correct ...

*May 27, 2013 by Gayle*

**math **

Consider the following. (a) What percentage of a normal distribution is greater than the mean? (Give your answer correct to the nearest percent.) Incorrect: Your answer is incorrect. . % (b) What percentage is within 1 standard deviation of the mean? (Give your answer correct ...

*May 30, 2013 by Nora 2*

**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 60 people. (You may need to use the standard normal distribution table. Round your answers to the nearest whole number.) (a) How ...

*December 3, 2013 by Anonymous*

**math**

A standard deck of cards is made up of four suits with 13 cards in each suits (total of 52 cards). If we randomly sample five cards from a standard deviation of $6000. What is the cutoff salary for teachers in the bottom 10%? Answer choice: a) 5/2,598,960 b) 1287/2,598,960 c)...

*April 16, 2010 by nicole*

**statistics**

A score that is 10 points below the mean corresponds to a z-score of z=-2.00. What is the population standard deviation?

*February 5, 2008 by Joan*

**Stats**

True or false: The distribution with the largest range necessarily has the largest standard deviation.

*January 22, 2010 by KLM*

**statistics**

In a distribution of scores, X=62 corresponds to z=+0.50, and X=52 corrsponds to z=-2.00. Find the mean and standard deviation for the distribution.

*June 20, 2010 by dray*

**Statistics**

In a given normal distribution, the standard deviation is 14.4 and 8.27% of the distribution lies to the left of 60. What is the mean?

*October 3, 2010 by Lori*

**statistics**

A score that is 6 points below the mean corresponds to a z-score of z= - .50, what is the population standard deviation?

*March 9, 2012 by Amy*

**statistics**

1. On a measure of anxiety, the mean is 79 and the standard deviation is 12. What are the z-scores for each of the following raw scores?

*March 10, 2012 by bertha*

**maths a**

us e the formula z=x-u/SD to determine the z score for a score of 34.5 a normal distribution if the mean is 46.5 and the standard deviation is 8.7

*September 11, 2014 by jay*

**Psychological Statistics **

For a population with a mean of 80 and a standard deviation of 12, what is the Z score corresponding to an individual score of 92

*January 7, 2015 by Anonymous*

**math**

a sample consists of the following n =6 scores: 2, 7, 4, 6, 4, and 7 compute the mean and standard deviation for the sample

*February 16, 2015 by Bridget*

**statistics**

Average is 8500 with a standard deviation. Of 1500 with a z score of -2.98 a z score of +1.00 what are the actual bonuses

*July 7, 2015 by Anonymous*

**Psychological Stats**

For a population with a mean of 80 and the standard deviation of 12, what is the Z score corresponding to an individual score of 71?

*June 23, 2016 by Tara*

**statistics**

the correlation between two tests given to 100 students in the junior clas is .70 the mean for the first test was 125 with standard deviation 20 the mean of the second test is 80 with standard devation 10 a student took the first test and scored 100. what is your best estimate...

*March 4, 2012 by Anonymous*

**Math**

The systolic blood pressure of 18-year-old women is normally distributed with a mean of 120 mm Hg and a standard deviation of 12 mm Hg. What percentage of 18-year-old women have a systolic blood pressure that is within 3 standard deviations of the mean on either side? Apply ...

*May 4, 2016 by angela*

**finite math**

1. what are the mean and standard deviation for this distribution of weekly take-home pay amounts? 2. what percentage of the pay amounts lie within 1 standard deviations of the mean? 3. what percentage of the pay amounts lie within 2 standard deviations of the mean? 4. what ...

*April 14, 2011 by margie*

**Algebra**

1)A bookshelf holds 4 mysteries, 3 biograpghies, 1 book of poetry, and 2 reference books. If a book is selected at random from the shelf, find the probability that the book selected is a biography or reference book. A)1/2 B)1/6 C)5/6 D)3/50 I chose A 5 bio/reference/10 total ...

*February 22, 2008 by Jon*

**math**

If a group of data has a mean of 19 and a standard deviation of 77.8, what is the interval that should contain at least 88.9% of the data?

*June 8, 2009 by Rachel*

**Statistics**

How is finding the standard deviation a measurement of a data\'s center? my teacher said it measured the center...

*August 28, 2009 by Statistics*

**math**

calculate the range, variance, standard deviation, and interquartile range for the data set given {72, 80, 80, 82, 88, 90, 96}

*October 11, 2009 by please help *

**Math**

calculate the range, variance, standard deviation, and interquartile range for the data set given {72, 80, 80, 82, 88, 90, 96}

*November 1, 2009 by Anonymous*

**math**

A set of data is normally distributed with a mean of 16 and a standard deviation of 0.03. What percent of the data is between 15.2 and 16?

*March 10, 2010 by Sally*

**Math**

calculate the range, variance, standard deviation, and interquartile range for the data set given {72, 80, 80, 82, 88, 90, 96}

*December 12, 2010 by Dominick*

**Statistics**

A random sample is obtained from a normal population with a mean that equals 80 and a standard deviation that equals 8

*March 12, 2011 by Jim*

**statistics**

If there are 200 students in a sample, and the mean = 45 and the standard deviation = 4. How many of these students will have a score under 41?

*November 14, 2011 by Julie*

**maths**

A loaf of bread is normally distributed with a mean of 22 oz and a standard deviation of 0.5 oz. What is the probability that a loaf is larger than 21 oz?

*January 31, 2012 by atul*

**statistics**

if the mean of a test score is 30 and the standard deviation is 3.7. which score could be expected to occur the least often?

*March 12, 2012 by Anonymous*

**stastics**

A population has mean 53 and standard deviation 12. Calculate the mean of x bar for a random sample of size 10.

*November 11, 2012 by Anonymous*

**psyc**

A normal distribution has µ = 80 and standard deviation = 10. What is the probability of randomly selecting a score greater than 75 from this distribution?

*March 3, 2013 by shauna*

**statistics**

the average score on the statistics quiz was a 70, and there was a standard deviation of 10 points. If the z-socre was -1.0 what is the percentile rank?

*March 2, 2014 by kim*

**math**

The test scores for a math class are shown below 83,85,82,93,83,84,95,87,86,94 what is the standard deviation of the data set?

*May 19, 2014 by heather*

**statistics**

there are 500 passenger with a mean age of 60 years and a standard deviation of 12. what is the minimum age of the oldest 20%?

*April 19, 2015 by Busisiwe*

**TP**

What is Standard Deviation? As in what does it measure, is it a measure of spread of a graph of results?

*May 29, 2008 by Maths*

**algebra 2**

how do i set up data to find the standard deviation of the data?

*May 6, 2010 by chicken littell*

**algebra 2**

how do i set up data to find the standard deviation of the data?

*May 6, 2010 by chicken littell*

**Math**

what is a range, variance, standard deviation, and interquartile range

*December 12, 2010 by Dominick*

**Statistics**

What will adding 50 to each score in a distribution do to the standard deviation of that distribution?

*November 24, 2011 by Brea*

**variation**

IF arithmetic mean is 10 and V(X)=4 find mean and standard deviation of z where Z=5x+4

*December 1, 2011 by Anonymous*

**statistics**

An experiment was conducted to determine the abrasion resistance of a new type of automobile paint. Twelve different strips of metal were painted with the new paint. The abrasion resistance of each piece was then tested on a machine. In the sample, the abrasion resistance ...

*April 2, 2014 by Nicky*

**statistics**

A normal distribution has a mean = 100. Find its standard deviation if 17% of the values exceed 144. All I can say is wow. Book is of no help. Neither is teacher. Can anyone help?

*March 11, 2008 by Mete*

**Statistical Methods**

The mean price of purchases is $110 and the standard deviation = $12. What is the probability of a purchase exceeding $90? I need help reviewing. Please give some input.

*March 11, 2008 by Mete*

**statistics**

Scores on a test are normally distributed with a mean of 68.2 and a standard deviation of 10.4. Estimate the probability that among 75 randomly selscted students, at least 20 of them score greater that 78.

*April 13, 2008 by Jean*

**Statistics**

The high temperature X (in degrees Fahrenheit) on January days in Columbus, Ohio varies according to the Normal distribution with mean 21 and standard deviation 10. the value of P(X<10)is?

*March 13, 2010 by Anonymous*

**Statistics**

The high temperature X (in degrees Fahrenheit) on January days in Columbus, Ohio varies according to the Normal distribution with mean 21 and standard deviation 10. the value of P(X<10)is?

*March 13, 2010 by Anonymous*

**math**

identify what is the 90 percent confidence interval for occupational prestige for respondents with only a bachelor's degree (N=750), given you have known their mean=52.74, standard deviation=12.67.

*April 4, 2011 by Nancy*

**math**

Use Chebyshev’s theorem to find what percent of the values will fall between 162 and 292 for a data set with a mean of 227 and standard deviation of 13.

*June 23, 2011 by denise*

**statistics**

For the following scores, find the (a) mean, (b) median, (c) sum of squared deviations, (d) variance, and (e) standard deviation: 1,112; 1,245; 1,361; 1,372; 1,472

*August 14, 2011 by Donna*

**statistics**

cost of producing is 50 cents each and they sell for 1.25 each. demand for programs at each game is normally distributed with a mean of 2500 and standard deviation if 200. how many shouild be prodcued

*November 19, 2011 by Anonymous*

**statistics**

assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 20. find the probability that a randomly selected adult has an IQ less than 20.

*March 14, 2012 by samantha *

**statistics**

psychologist wants to interview subjects with IQ scores are normally distributed with mean of 100 and standard deviation of 15. find the score that separating the top of IQ frin the bottom 90%

*May 9, 2012 by joe*

**Statistics for Social Science**

A random sample of 80 students at a largae school shows an average grade of 72 in Algebra with a standard deviation of 4. Find the standar error.

*November 24, 2012 by Pearl*

**statistics**

sample size needed with a mean of 100,standard deviation of 20 for the the population of normal adults an iq range to fall between 2 iq points with 95% confidence interval

*December 1, 2012 by krissy*

**Statics**

A candy machine distributor collects the coins from 100 machines. The standard deviation is $3.25. With probability 98%, what is the maximum error about the true mean that will result?

*December 1, 2012 by Heather*

**Biostats **

If the average (xbar) on an assignment in a class was 82% with a standard deviation (s) of 4.8, what is the z-score for someone scoring 75% (round to the one hundredths place or two decimal places)?

*February 3, 2013 by brittany *

**statistics**

I need a estimate within $25, the true average of amount of postage a company spends each year. If I want to be 98% confident, how large a sample is necessary? The standard deviation is known to be $80

*March 29, 2013 by ann*

**Stats **

The high temperature X (in degrees Fahrenheit) on January days in Columbus, Ohio varies according to the Normal distribution with mean 21 and standard deviation 10. The value of P(X < 10) is

*March 29, 2014 by Tracy *

**statistics**

How large a sample should be selected to provide a 95% confidence interval with a margin of error of 10 (to the nearest whole number)? Assume that the population standard deviation is 40.

*April 21, 2014 by Vanessa*

**data analysis**

A survey of 1500 college students found that 675 stay on campus in a dorm. Find the mean and standard deviation of the proportion of the sample.

*May 20, 2014 by Anonymous*

**Math**

Scores on a marketing exam are known to be normally distribute with mean and standard deviation of 60 and 20, respectively. The syllabus suggests that the top 15% of the students will get an A in the course. What is the minimum score required to get an A?

*September 25, 2014 by Sam*

**statistics**

studies indicate that drinking water supplied by some old lead-lined city piping systems may contain harmful levels of lead. an important study of the Boston water supply system showed that the distribution of lead content readings for individual water specimens had a mean and...

*March 14, 2011 by dinhgde*

**chemistry**

This is super confusing complex brain killing 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...

*March 28, 2010 by Simon*

**Statitics**

25 periodicals have a mean of $180 and a standard deviation of $12. form a 95% confidence interval on the population mean.

*March 20, 2009 by Sally*

**STATISTICS**

Find the sample standard deviation s for the following sample data. Round your answer to the nearest hundredth. x: 23 20 11 33 27

*June 3, 2010 by Jake*

**Math**

Suppose the mean heights of a population are 72 inches with a standard deviation of 2 inches. What height (x) corresponds to the z value of 1

*May 14, 2011 by Phillip*

**math**

with a mean of 515 and a standard deviation of 135, what percentage score 110-515 using the 68-95-99.7 rule

*October 26, 2011 by Ron*

**Math**

Given the following frequency distribution, find the mean, variance, and standard deviation. Class Frequency 31-33 18 34-36 25

*November 10, 2011 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

*November 10, 2011 by Jennifer*

**statistics**

If scores are normally distributed with a mean of 3.06 and a standard deviation of 0.84, what percent of the scores is: (a) greater than 3.9? (b) less than 2.22? (c) between 2.22 and 3.9?

*November 28, 2011 by jennifer*

**statistics**

If scores are normally distributed with a mean of 3.06 and a standard deviation of 0.84, what percent of the scores is: (a) greater than 3.9? (b) less than 2.22? (c) between 2.22 and 3.9?

*November 28, 2011 by jennifer*

**algebra**

Diameter of an electric cable is normally distributed with a mean f 0.8 with a standard deviation of 0.01. What is the probability that the diameter will exceed 0.83?

*November 29, 2011 by debra rees*

**statistics**

A set of data is normally distributed with a mean of 98 and a standard deviation of 15. What is the probability that the value from the data is less than 88 ?

*December 1, 2011 by Anonymous*

**algebra**

A normal distribution has a mean of 98 and a standard deviation of 6. What is the probability that a randomly selected x-value from the distribution is at least 80?

*May 23, 2012 by jenny*

**statistics**

For a population with a mean of 250 and a standard deviation of 47, return each of the following z scores to raw scores on this variable. a. 0.54 b. -2.66 c. -1.0 d. 1.79

*September 3, 2012 by tammy*

**stat in psyc**

A normal distribution has µ = 80 and standard deviation = 10. What is the probability of randomly selecting a score greater than 90 from this distribution

*March 3, 2013 by shauna*

**Statistics**

For the following set of scores, fill in the cells. The mean is 70 and the standard deviation is 8. Raw score Z score 68.0 ? ? –1.6 82.0 ? ? 1.8 69.0 ? ? –0.5 85.0 ? ? 1.7 72.0 ?

*November 26, 2014 by KIM*

**math**

A normal distribution has a mean of 44 and a standard deviation of 4. What is the probability that a value drawn from the distribution lies between 36 and 48? A) 0.18 B) 0.32 C) 0.82 D) 0.91

*September 14, 2015 by Mark*

**algebra**

A normal distribution has a mean of 44 and a standard deviation of 4. What is the probability that a value drawn from the distribution lies between 36 and 48? A) 0.18 B) 0.32 C) 0.82 D) 0.91

*September 15, 2015 by Tyrice*

**Statistics**

We observe a sample proprotion p-hat = 0.3. If the standard deviation of the sampling distribution of p-hat is 0.04, what is the 95% confidence interval for p?

*November 10, 2015 by Morgan*

**Statistics**

The psychologists are interested in whether depressed people undergoing group therapy will perform a different number of activities of daily living before and after group therapy. Therefore, the psychologists have randomly selected 8 depressed clients in a 6-week group therapy...

*May 24, 2010 by Ashley*

**Algebra**

For questions 1 and 2 use the following info. The numbers are in this order: 456,306,160,363,376,935,54,349 1)Find the mean, median ,mode, and standard deviation of the data. Round to the nearest hundredth, if nessesary. mean= added all numbers and divided by 8 and got 384.9 ...

*March 5, 2008 by Jon*

**STATISTICS PLESE HELP!!**

studies indicate that drinking water supplied by some old lead-lined city piping systems may contain harmful levels of lead. an important study of the Boston water supply system showed that the distribution of lead content readings for individual water specimens had a mean and...

*November 8, 2010 by Courtney*

**Finance**

If the CORR between stock are as follows CORR(A,B)=.85 (A,C)=.60 (A,D)=.45 and expected return is 8% and standard deviation is 20% what would be the best portfolio and why?

*June 21, 2008 by Tiffany*

**math**

If the population is bell-shaped, then the interval that is 3 standard deviation away from the center contains what percent of data in the population?

*February 7, 2009 by Sally*

**physics**

If sigma(t)^2 denotes the standard deviation in the quantity t^2, show that sigma(t)^2=2tsigma(t) I dont even know where to begin... help plzz

*February 15, 2009 by Anna*

**Algebra 2: Probability and Stats**

The scores on an exam are normally distributed, with a mean of 77 and a standard deviation of 10. What percent of the scores are greater than 87? * 68% * 16% * 84% * 2.5%

*May 24, 2010 by Skye*

**Data and statistics**

Calculate the z score for an SAT Verbal score of 510, mean of 500, and standard deviation of 100.

*July 22, 2010 by Beverly*

**math**

Find the standard deviation for the data. Round your answer to one more decimal place than the original data. {15,13,31,42,58,78}

*September 3, 2010 by David*

**statistics**

A company manufactures calculators in batches of 64 and there is a 5% rate of defects. What is the standard deviation for the number of defects per batch?

*October 15, 2010 by Rebecca*

**statistics**

A company manufactures calculators in batches of 64 and there is a 5% rate of defects. What is the standard deviation for the number of defects per batch?

*October 15, 2010 by Rebecca*

**Statistics**

IQ test scores are normally distributed with a mean of 100 and a standard deviation of 15. Find the x- score that corresponds to a z-score of 2.33.

*March 13, 2011 by chalulu*

**statistics**

A population is normally distributed with a mean of 40 and a standard deviation of 6. For samples of size 10, what is the probability that the sample mean will be more than 42?

*March 17, 2011 by anne*

**statistics**

A standardized test is designed so that scores have a mean of 50 and a standard deviation of 4. What is the probability that a test score is above 54?

*April 11, 2011 by wendy*

**math**

A standardized test is designed so that scores have a mean of 50 and a standard deviation of 4. What is the probability that a test score is above 54?

*April 11, 2011 by wendy*

**statistics**

At a neighboring university, the average salary is also $45,000 and the distribution is normal. If $47,000 has a z score of 1.5, what is the standard deviation?

*April 24, 2011 by maria*

**statistics**

Calculate SS, variance, and standard deviation for the following sample of n _ 4 scores: 3, 1, 1, 1. (Note: The computational formula works well with these scores.)

*June 22, 2011 by Liz *

**statistics**

Calculate SS, variance, and standard deviation for the following population of N _ 7 scores: 8, 1, 4, 3, 5, 3, 4. (Note: The definitional formula works well with these scores.)

*June 22, 2011 by Liz *

**business statistics**

The sampling distribution of x bar must be a normal distribution with a mean 0 and standard deviation 1. true or false

*July 11, 2011 by CS*

**statistics**

A random variable X is best described by a continuous uniform distribution from 20 to 45 inclusive. The standard deviation of this distribution is approximately

*August 16, 2011 by Anonymous*