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#4. The probability density function of X, the lifetime of a certain type of electronic device (measured in hours), is given by

f (x) = 10/x2 x > 10
f (x) = 0 x ≤ 10

(a) Find P{X > 20}.
(b) What is cumulative distribution function of X?
.. (see attachment)

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this shows how to find the cumulative distribution function.

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