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5 April, 13:47

The average score on an aptitude test is 80 with a standard deviation of 10. one person scored a 100. what is that person's z-score?

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  1. 5 April, 14:14
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    Z-score for a variable X is calculated using

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

    Here

    mean=80

    standard deviation=10

    x=100

    Z (100) = (100-80) / 10=20/10=2
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