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March 25, 2017

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Consider the following test scores obtained by a class.



Test score

90

80

70

60

50



Frequency

1

4

11

6

2

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

  • Math - ,

    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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