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20 October, 22:11

In a certain normal distribution, find the standard deviation σ when μ = 50 and 10.56% of the area lies to the right of 55.

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  1. 20 October, 22:22
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    4

    Step-by-step explanation:

    P (x > 55) = 0.1056

    P (x < 55) = 1 - 0.1056

    P (x < 55) = 0.8944

    z = 1.25

    z = (x - μ) / σ

    1.25 = (55 - 50) / σ

    σ = 4
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