Question
Given $X \sim B (n, p)$. If $n=20, E ( X )=10$, find $p$, Var. (X) and S.D. (X)
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| $x_i$ | -3 | -1 | 0 | 1 | 3 |
| $p_i$ | 0.05 | 0.45 | 0.20 | 0.25 | 0.05 |