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If X Is a Normal Random Variable with a Mean ≥\geq

Question 85

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If X is a normal random variable with a mean of 45 and a standard deviation of 8, find the following probabilities:
a. P(X ≥\geq 50).
b. P(X ≤\leq 32).
c. P(37 ≤\leq X ≤\leq 48).
d. P(50 ≤\leq X ≤\leq 60).
e. P(X = 45).

Correct Answer:

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a. 0.2643.
b. 0.0516...

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