math

A set of data items is normally distributed with a mean of 70. Convert the data item to a z-score, if the standard deviation is as given.
data item: 80; standard deviation: 15

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  1. z = (x - mean)/ sigma

    z = (80 - 70)/15

    = 10/15

    = 2/3 = .666666666666667 :)

    If there is more, use
    http://davidmlane.com/hyperstat/z_table.html

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  2. A set of data items is normally distributed with a mean of 9090 and a standard deviation of 1212. Convert 7878 to a​ z-score

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  3. A set of data items is normally distributed with a mean of 90 and a standard deviation of 12. Convert 78 to a​ z-score

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