6) Scores on an examination are assumed to be normally distributed with mean 78 and variance 36. Suppose that students scoring in the top 10% of this distribution receive an A. What is the minimum score a student must achieve to earn an A grade?

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A: Number of boys = 10Number of girls = 5

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Q: P(65<x<74) P(65<x<74)= (Round to four decimal places as needed.)

A: X~N( μ , ?)μ=80     , ?=5Z-score =( x - μ )/?

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A: It is given that Mean = 16Std. deviation = 1

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A: P(H) = 0.5

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A: X~N( μ , ?)μ=20.2    , ?=5.4Z-score =( x - μ )/?

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A:

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Q: please answer this question

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Q: Help pls: Suppose X ∼ Exp(λ). Find Var(X).

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Q: Help: Suppose X ∼ Unif(a, b). Find Var(X).

A: Suppose X ∼ Unif(a, b).

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A: Mean=1, variance=13