The p.d.f. of a random variable $X$ is given by $f(x) = \frac{k}{\sqrt{x}}$ for $0 \leq x \leq 4$ and $f(x) = 0$ otherwise. Then $P(1 < X < 4) = $
- A$\frac{1}{2}$
- B$\frac{1}{3}$
- C$\frac{1}{5}$
- D$\frac{3}{4}$
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