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Question

Out of 2000 families with 4 children, the number of families you expect to have at least one boy is

A
1875
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B
750
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C
1250
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D
625
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Solution

The correct option is D 1875
The probability of 4 families having at-least one boy will be
14C0(12)4
=1116 =1516
Hence the expected frequency for 2000 families is
=2000(1516)
=125(15)
=1875

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