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3 December, 17:43

What is the standard deviation of the data set given below?

4, 7, 8, 9, 12

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  1. 3 December, 18:05
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    First find the mean (average)

    (4+7+8+9+12) / 5=8

    Now find the sum of squared differences for the terms ... (the difference between the elements and the mean squared)

    (4-8) ^2 + (7-8) ^2 + (8-8) ^2 + (9-8) ^2 + (12-8) ^2=34

    Now find the variance, that is the average of the squared differences ...

    v=34/5

    The standard deviation is the square root of the v

    st=2.6
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