X | 0 | 1 | 2 | 3 |
P(X) | $\frac{1}{8}$ | $\frac{3}{8}$ | $\frac{3}{8}$ | $\frac{1}{8}$ |
अतः माध्य = $\Sigma$X P(X) = 0$ \times \frac{1}{8}$$+1 \times \frac{3}{8}$$+2 \times \frac{3}{8}$$+3 \times \frac{1}{8}$
= $\frac{3}{8}$ $+\frac{6}{8}$$+\frac{3}{8}$$=\frac{12}{8}$$=\frac{3}{2}$ = 1.5