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10 February, 22:21

The scores on a statistics exam have a normal distribution and have a mean of 99 and a standard deviation of 11. One individual's score is 128. Find the z-score of this value.

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  1. 11 February, 00:00
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    2.64

    Step-by-step explanation:

    The z score is calculated as

    z = (x-mean) / Sd

    The mean of scores of statistics exam=μ=99

    The standard deviation of scores of statistics exam=σ=11

    Individual's score in statistics exam=x=128

    z=128-99/11=29/11=2.64

    Hence, the z score of individual score is 2.64.
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