Saturday

March 28, 2015

March 28, 2015

Posted by **kesha** on Thursday, June 21, 2012 at 6:02pm.

Class

Frequency

61-63

19

64-66

17

67-69

5

70-72

10

73-75

12

- Statics -
**PsyDAG**, Friday, June 22, 2012 at 1:19pmUse 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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