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Statistics
For a normal distribution with a mean of m = 80 and a standard deviation of s = 20, find the proportion of the population corresponding to each of the following scores. a. Scores greater than 85 b. Scores less than 100 c. Scores
asked by Lyndon on July 26, 2010 
Math
I need help with this these two problem PLEASE!!! For a population with a mean of μ 80 and a standard deviation of 12, find the zscore corresponding to each of the following samples. a. M 83 for a sample of n 4 scores
asked by Tracy on February 1, 2013 
statistics
The distribution of scores on the SAT is approx. normal with mu= 500 and std dev=100. a)what proportion of the population have SAT scores above 650? b)what proportion of of the population have SAT scores below 540? c)what is the
asked by Tommy on February 7, 2008 
statistics
The sum of the squared deviation scores is SS = 20 for a population of N = 5 scores. What is the variance for this population? a. 4 b. 5 c. 80 d. 100
asked by Lyndyc on December 31, 2013 
probability and statistics
a population forms a normal distribution with a mean of u=80 and a standard deviation of o=15. for each of the following samples, compute the zscore for the sample mean and determine whether the sample mean is a typical,
asked by darrell on January 6, 2012 
statistics
Scores on a national exam assume a normal distribution with a population mean of 50 and population standard deviation of 10 points. A sample of 36 exam scores was selected from UCA with a mean score of 58 points. Using a
asked by Anonymous on April 18, 2014 
Stats...is this correct??
Scores on the StanfordBinet 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? z
asked by Jen on October 18, 2011 
statistics
The distribution of scores is normal with a ì = 100 and ó =15. What proportion of the population have scores A) Above 130? B) Below 90? C) Above 110?
asked by chante on March 20, 2012 
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 =
asked by Dianne on June 21, 2012 
statistics
Assume that a set of test scores is normally distributed with a mean of 100 and a standard devaiton of 20. Use the 689599.7 rule to find the following quantities: a. percentages of scores less than 100 b. relative frequency of
asked by terry on July 19, 2010