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Suppose X is a normal random variable with μ = 390 and σ = 40. Find...

Suppose X is a normal random variable with μ = 390 and σ = 40. Find the values of the following probabilities. (Round your answers to four decimal places.)

(a)    P(X < 452)


(b)    P(430 < X < 474)


(c)    P(X > 430)

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