The following is the p.d.f. of a continuous random variable $X$: $f(x) = \begin{cases} \frac{x}{8} & , \text{if } 0 < x < 4 \\ 0 & , \text{otherwise} \end{cases}$
Then $F(0.5)$,$F(1.7)$,and $F(5)$ are respectively:
Then $F(0.5)$,$F(1.7)$,and $F(5)$ are respectively:
- A$\frac{1}{64}, 1, 0.18$
- B$0.0156, 0.18, 1$
- C$0.18, 0.0156, 1$
- D$1, 0.0156, 0.18$
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The probability distribution of a random variable $X$ is given below.
$X = x$ $0$ $1$ $2$ $3$ $P(X = x)$ $\frac{1}{10}$ $\frac{2}{10}$ $\frac{3}{10}$ $\frac{4}{10}$
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|---|---|---|---|---|
| $P(X = x)$ | $\frac{1}{10}$ | $\frac{2}{10}$ | $\frac{3}{10}$ | $\frac{4}{10}$ |
Then the variance of $X$ is
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