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31 January, 12:42

Betty scored 56 on a statistics test that had a mean of 65 and a standard deviation of 5. What was the Z - score on the test?

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  1. 31 January, 12:56
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    Z-score for a variable X is calculated using

    Z (x) = (x-mean) / standard deviation.

    Here

    x=56

    mean=65

    standard deviation=5

    so

    Z (65) = (65-56) / 5=9/5=1.8
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