Distribution
the Probability Distribution of a Discrete Random Variable X $$\begin{array} { c | c c c c } x & 0 & 1 & 2 & 3 \\\hline p ( x ) & .25 & .40 & .20 & .15\end{array}$$

Short Answer

Distribution
The probability distribution of a discrete random variable x is shown below. $$\begin{array} { c | c c c c } x & 0 & 1 & 2 & 3 \\\hline p ( x ) & .25 & .40 & .20 & .15\end{array}$$
-Find the expected value,the variance,and the standard deviation of x.
E(x)= ____________________.
Variance = ____________________.
SD = ____________________.