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Suppose that the average lifetime of a plane is 100 working hours and that the lifetime...

Suppose that the average lifetime of a plane is 100 working hours and that the lifetime distribution is exponential.
(a) Estimate the probability that the plane will work at least 50 hours.
(b) Given that the plane has functioned for 50 hours, what is the chance that it fails in the next 25 hours.

(c) Suppose that two planes, one in active, the other in reserve (if the primary one malfunctions, the second will be used at once). What is the chance that these two planes remain working more than 50 hours?

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