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20 January, 22:20

A normal distribution of data has a mean of 15 and a standard deviation of 4. How many standard deviations from the mean is 25?

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  1. 20 January, 22:38
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    So the difference from the mean and the value is:

    25 - 15 = 10

    and now we need to know how many standard deviations of 4 are in that range, that is:

    10/4 = 2.5

    so there are 2.5 std deviations from the mean if the value is 25
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