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Question7: The lifetime (hours) of an electronic device is a random variable with the exponential probability...

Question7: The lifetime (hours) of an electronic device is a random variable with the
exponential probability density function:

f (x) = 1/50 e^(-x/50) for x≥ 0


a) what is the mean lifetime of the device?
b) what is the probability that the device fails in the first 25 hours of operation?
c) what is the probability that the device operates 100 or more hours before failure?

Math   Statistics-And-Probability   
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