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14 October, 14:53

For a normal population with a mean of µ = 80 and a standard deviation of σ = 10, what is the probability of obtaining a sample mean greater than m = 75 for a sample of n = 25 scores?

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  1. 14 October, 14:54
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    On a TI-83/84 calculator,

    ... normalcdf (75, 150, 80, 10/√ (25)) = 0.9937903347

    About 99.4%
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