Posted by kim on Monday, October 4, 2010 at 6:22am.
A survey of 40 clothing stores reported these numbers of sales held during a randomly selected year
11-15,16-20,21-25,26-30, 31-35, 36-40 and the frequencies are 3,5,12,9,8,3 Caculate the mean variance and standard deviation
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
I'll let you do the calculations.
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