The time (in hours) required to repair a machine is an exponential distributed random variable

with paramter = 1

2 . What is

Let X denote the time (in hours) required to repair a machine. X Exp

ô€€€1

2

. The PDF for

the exponential distribution is

f(x) = eô€€€x

(a) the probability that a repair time exceeds 2 hours;

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