4-23. For the probability density function f (x) = - 1 200 ex/200, x > 0; 0...

Question:

4-23. For the probability density function f (x) = - 1 200 e−x/200, x > 0;

0 elsewhere.

find the associated cumulative distribution function. Use the latter to determine:

(a) P(X > 80)

(b) P(50 < X ≤ 90)

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