Posted by kesha on Thursday, June 21, 2012 at 6:02pm.
Use the midpoint of the intervals to determine values.
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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