statistics
posted by Anonymous .
98,99,99,103,101,102,104,89,87,90,90
Find the 25th and 75th percentiles.
Within how many standard deviations of the mean is the value 102.
Find the interquartile range.

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
Z = (scoremean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion (.75 or .25) related to the Z score. Insert the values in the above equation.
I'll let you do the calculations.
Respond to this Question
Similar Questions

Statistics
98,99,99,103,101,102,104,89,87,90,90 Find the interquartile range. 
Statistics
98,99,99,103,101,102,104,89,87,90,90 Within how many standard deviations of the mean is the value 102? 
Statistics
98,99,99,103,101,102,104,89,87,90,90 Find the 25th and 75th percentiles 
Statistics
87,89,90,90,98,99,99,101,102,103,104 Find the 25th and 75th percentiles. 
Statistics
87,89,90,90,98,99,99,101,102,103,104 Within how many standard deviations of the mean is the value 102? 
Statistics
87,89,90,90,98,99,99,101,102,103,104 Find the interquartile range. 
statistics
It is known that the population mean for the Full Scale IQ of the WAIS is 100 with a standard deviation of 15. A researcher assesses a sample of 200 adults and find that they have a mean Full Scale IQ of 102. The point estimate of … 
statistics
It is known that the population mean for the Full Scale IQ of the WAIS is 100 with a standard deviation of 15. A researcher assesses a sample of 200 adults and find that they have a mean Full Scale IQ of 102. The point estimate of … 
statistics
It is known that the population mean for the Full Scale IQ of the WAIS is 100 with a standard deviation of 15. A researcher assesses a sample of 200 adults and find that they have a mean Full Scale IQ of 102. The point estimate of … 
statistics
It is known that the population mean for the Full Scale IQ of the WAIS is 100 with a standard deviation of 15. A researcher assesses a sample of 200 adults and find that they have a mean Full Scale IQ of 102. The point estimate of …