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Question
1800 families with 2 children were selected randomly and the following data were recorded:
| No. of girls in a family | 2 | 1 | 0 |
| No. of families | 700 | 850 | 250 |
Computer the probability of a family chosen at random having: 2 girls
Solution
Total number of families n(S) = 1800.
Event = {2 girls}
n(E) = 700
P(E) = ?
∴ P(E) = `"n(E)"/"n(S)" = 700/1800 = 7/18`.
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