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December 5, 2016

Search: The standard deviation of the...

Number of results: 9,904

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 ...
December 4, 2012 by Debin

Statistics
A statistics professor gives a test and finds that the scores are normally distributed with a mean of 25 (out of 100) and a standard deviation of 5. She plans to curve the scores in one of two ways. 1) She could add 50 points to each grade. 2) She could use the following ...
July 5, 2011 by Nikki

Math
For a specific type of machine part being produced, the diameter is normally distributed, with a mean of 15.000 cm and a standard deviation of 0.030 cm. Machine parts with a diameter more than 2 standard deviations away from the mean are rejected. If 15,000 machine parts are ...
February 9, 2016 by Ashley Colley

statistics
The Acme Company has developed a new battery. The engineer in charge claims that the new battery will operate continuously for at leas 7 minutes longer than the old battery. To test the claim, the company selects a simple random sample of 100 new batteries and 100 old ...
February 16, 2012 by Maria E. S.

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 ...
April 12, 2011 by Mary

math
Calculate the range, standard deviation, and interquartile range for the data set: {-1, 0, 1, 2, -1, 0, 1, 2, -1, 0, 1, 2, 1, 1, -2}
February 27, 2010 by Jillian

Data and Statistics
Calculate the z score for an ACT score of 12, a mean of 20, and the standard deviation is 5.
July 22, 2010 by Beverly

statistics
if the mean is 20 and the standard deviation is 4, at least what percentage will have a mean between 15 and 25?
June 20, 2011 by danette

statistics
Mean class scored 74 w/ standard deviation of 4.3. What is range of scores for 68% of class?
January 10, 2012 by Joe

Statisticis
16. Describe what is measured by the mean and what is measured by the standard deviation for a set of scores.
September 17, 2012 by Mary beth

statistics
true or false The value for the standard deviation cannot be larger than the value for the range.
January 3, 2014 by Lyndyc

statistics
For a population with a mean of 80 and a standard deviation of 10, what is the Z score corresponding to an individual score of 95?
June 8, 2016 by tonya

chemistry
Just..... don't get it 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 ...
March 29, 2010 by Sai

statistics
For a sample with a mean of M=45, a score of x=59 corresponds to z=2.00.What is the sample standard deviation?
January 31, 2011 by Dana

statistics
For a sample with a mean of M 45, a score of 59 corresponds to z 2.00. What is the sample standard deviation?
March 7, 2011 by olga

statistics
There are 20 numbers, the highest is 91, the lowest is 34. The mean is 60 and the standard deviation is 5. What are the 20 numbers?
June 27, 2011 by Annie

statistics
There are 20 numbers, the highest is 91, the lowest is 34. The mean is 60 and the standard deviation is 5. What are the 20 numbers?
June 27, 2011 by Annie

statistic
a population of n = 100 score has u = 30 and standard deviation =4 what is the population variance
September 26, 2011 by mary

Statistics
Find the Standard Deviation for this distribution of scores. Then find the z score for X=86. N=17 98, 92, 86, 84 , 76, 74 , 72 , 72, 72 , 70, 70, 66, 60 ,54, 32,30
December 7, 2013 by Lyndyc

statistics
what is the weight between 5.5 to 6 ounce when mean is 5,75 ounce and standard deviation is 0.11
November 7, 2014 by Anonymous

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 26, 2013 by Gayle

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

Trig. Math
The mean score on a normally distributed exam is 42 with a standard deviation of 12.1. Which socre would be expected to occur less than 5% of the time? 1) 25 2) 32 3) 60 4) 67 -I know the answer is 67, but i don't know why .. PLEASE help!
January 20, 2011 by Tami

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

physics
If sigma(t)^2 denotes the standard deviation in the quantity t^2, show that sigma(t)^2=2tsigma(t) I don't even know where to begin... help plzz
February 15, 2009 by Anna

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

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