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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
(ii) 2 girls
Solution
Total number of families = 333 + 392 + 275 = 1000
(ii) Number of families having 2 girl = 275
`"Required probability" = "Number of families having 1 girls"/"Total number of families"`
= `275/1000 = 11/40`
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