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Let X be the duration of a telephone call in minutes and suppose X has p.d.f. f(x) = c e x/10 for x 0. Find

Let X be the duration of a telephone call in minutes and suppose X has p.d.f. f(x) = c e x/10 for x 0. Find c, and also find the chance that the call lasts less than 5 minutes.

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