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28 December, 22:00

Test scores are normally distributed with a mean of 100 and a standard deviation of 15. an individual's iq score is found to be 90. find the z-score corresponding to this value.

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  1. 29 December, 01:25
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    Z score = (data value-mean) / standard deviation

    z = (90-100) / 15=-0.6666666667
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