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22 January, 11:01

Suppose that a normal distribution has a mean of 20 and a standard deviation of 4. What is the z-score of 13?

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  1. 22 January, 11:23
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    -1.75.

    Step-by-step explanation:

    The z-score = (n - m) / d where n is the value (13) m = mean and d = standard deviation.

    = (13 - 20) / 4

    = - 1.75 (answer)
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