SOLUTION: The Wilson family was one of the first to come to the U.S. They had 4 children. Assuming that the probability of a child being a girl is .5, find the probability that the Wilson fa

Question 1145774: The Wilson family was one of the first to come to the U.S. They had 4 children. Assuming that the probability of a child being a girl is .5, find the probability that the Wilson family had at least 3 girls? At most 3 girls?
Answer by ikleyn(52787) (Show Source): You can put this solution on YOUR website!
.


(a)  At given conditions, the probability to have at least 3 girls 


         P( to have at least 3 girls ) = P(3) + P(4) =  +  =  +  = .    ANSWER



(b)  At given conditions, the probability to have at most 3 girls is equal

     to the COMPLEMENT of the probability to have 4 girls.


         P( to have at most 3 girls ) = 1 - P(4) = 1 -  = 1 -  =  = .   ANSWER

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