6. The annual amount of rainfall (in centimeters) in a certain area is a random variable with...

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6. The annual amount of rainfall (in centimeters) in a certain area is a random variable with the distribution function F (x) = B 0 x < 5 1 − (5/x2) x ≥ 5. What is the probability that next year it will rain

(a) at least 6 centimeters;

(b) at most 9 centimeters;

(c) at least 2 and at most 7 centimeters?

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