GATE EC 2014 Set 1 — Question 12
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Question
In a housing society, half of the families have a single child per family, while the remaining half have two children per family. The probability that a child picked at random, has a sibling is _____
Correct answer
0.65 to 0.68
Solution
Let be the total number of families in the housing society.
1.Number of families with a single child = . Total children from these families = .
2.Number of families with two children = . Total children from these families = .
Total number of children in the society = .A child picked at random has a sibling if they belong to a family with two children. The number of such children is .Probability .The official range is 0.65 to 0.68.Continue learning with Success Tracker
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