Problem

The probability density function of X, the lifetime of a certain type of electronic device...

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 Χ ?


(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?

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