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Posted by **Debin** on Tuesday, December 4, 2012 at 5:23am.

Test score

90

80

70

60

50

Frequency

1

4

11

6

2

Find the standard deviation (rounded to the nearest hundredth).

- Math -
**PsyDAG**, Tuesday, December 4, 2012 at 10:01amFind 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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