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Question 5 (10 points): probabilities of the normal distribution
Suppose X is a normally distributed random variable with a mean of 85 and a variance of 625.
Show the steps involved in the calculation.
(a) P(X> 112)
(b) P(X < 89)
(c) P(105< X < 121)
(d) Find b such that P(X

Sagot :

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