Question: The probability density function of X, the lifetime of a certain type of electronic device (measured in hours), is given by (a) Find P{X >

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

(a) Find P{X > 20}.
(b) What is the cumulative distribution function of X?
(c) What is the probability that, of 6 such types of devices, at least 3 will function for at least 15 hours? What assumptions are you making?

10 f(x)=-x > 10 0 x s 10

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