If X is a normal random variable with a mean of 78 and a standard deviation of 5, find the following probabilities:
a. P(X ? 87).
b. P(X ? 91).
c. P($\le$ X $\le$ ).

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The Answer of If X is a normal random variable with a mean of 78 and a standard deviation of 5, find the following probabilities:
a. P(X ? 87).
b. P(X ? 91).
c. P($\le$ X $\le$ ).

If X Is a Normal Random Variable with a Mean ≤\le≤

If X Is a Normal Random Variable with a Mean $\le$