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Suppose that X is waiting time in minute...

Suppose that X is waiting time in minutes for a but and its p.d.f. is given by
` f (x) = (1)/(5), " for " 0 le x le 5 ` and = 0 otherwise
Find the probability that
waiting time is more than 4 minutes .

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The correct Answer is:
`(1)/(5)`
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