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Probability density function of a random variable $X$ is given below

$$f(x) = \begin{cases} 0.25 & \text{ if } 1 \leq x \leq 5 \\ 0 & \text{ otherwise} \end{cases}$$

$P(X \leq 4)$ is

  1. $\dfrac{3}{4} \\$
  2. $\dfrac{1}{2} \\$
  3. $\dfrac{1}{4} \\$
  4. $\dfrac{1}{8}$
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