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3 May, 06:16

If the random variable x is normally distributed with a mean equal to. 45 and a standard deviation equal to. 40, then P (x ≥.75) is:

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  1. 3 May, 10:07
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    P (x ≥ 0.75) = P (z ≥ (0.75 - 0.45) / 0.40) = P (z ≥ 0.30/0.40) = P (z ≥ 0.75) = 1 - P (z < 0.75) = 1 - 0.077337 = 0.22663
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