Question

Find the expected number of boys in a family with 8 children, assuming the sex distribution to be equally probable.

Answer 1

Here, n =8
Let p be the probability of number of boys in the family.

\[p = \frac{1}{2}, q = \frac{1}{2}\]

\[\text{ Expected number of boys = mean } \]

\[ \Rightarrow np = 4\]