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25 October, 09:14

The mean score of a competency test is 82, with a standard deviation of 2. Between what two values do about 99.7% of the values lie?

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  1. 25 October, 09:15
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    99.7% encompasses about 3 standard deviations either side of the mean.

    82 ±3*2 = (76, 88)

    About 99.7% of the values lie between 76 and 88.
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