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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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The correct answer is option b) 0.8 

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

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