Question

1000 families with 2 children were selected randomly , and the following data were recorded : 

Number of girls in a family	0	1	2
Number of families	333	392	275

Find the probability of a family , having

(i) 1 girl 

Answer 1

Total number of families = 333 + 392 + 275 = 1000 

(i) Number of families having 1 girl = 392

`"Required probability" = "Number of families having 2 girls"/"Total number of families"`

= `392/1000 = 49/125`