Question

$2000$ families with $2$ children were selected randomly, and the following data were recorded.

Number of girls in a family	$2$	$1$	$0$
Number of families	$624$	$900$	$476$

Find the probability of a family, chosen at random, having $1$ girl

• A. $\frac{9}{20}$
• B. $\frac{10}{20}$
• C. $\frac{19}{20}$
• D. None of these

Answer 1

The correct option is A $\frac{9}{20}$

$P$(girl) $=\frac{\text{Family With One Girl}}{\text{Total}}$ $=\frac{900}{2000}=\frac{9}{20}$