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 750 families with 3 children were selected randomly and the following data recorded
If a family member is chosen at random, compute the probability that it has :

(i) no boy child
(ii) no girl child 

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(i) P(no boy child) =100 / 750  = 2 / 15
(ii) P (no girl child) = 120 /750  =4 / 25

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