Question

out of 1000 families having 3 childrens ech each
of how many would have expect to have
1) 2 boy and 1 girl
2)2 girls and one boy
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Answer 1

Answer:

The possibilities are 4 boys, 3 boys and a girl, 2 boys and 2 girls, 3 girls and one boy, 4 girls. ... Since all the other combinations contain at least one boy, the probability of at least one boy is 1-0.0625=0.9375 (15/16). In 1000 families with 4 children to get the expectation we multiply the probability by 1000=937.5.

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Answer 2

2 Because 1000 familes having 4 child