If r.v. X : waiting time in minutes for bus and p.d.f. of X is given by

\(f(x)= \{\frac{\frac{1}{5},}{0,} \ \ \frac{0\leq x\leq 5, }{otherwise,}\)

then probability of waiting time not more than 4 minutes is = _______

A) 0.3 B) 0.8 C) 0.2 D) 0.5

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