SOLUTION: One day 13 babies are born at a hospital. Assuming each baby has an equal chance of being a boy or a girl what is the probability that at most 11 of the 13 babies are girls

Question 1132191: One day 13 babies are born at a hospital. Assuming each baby has an equal chance of being a boy or a girl what is the probability that at most 11 of the 13 babies are girls
Found 2 solutions by Boreal, ikleyn:
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
What is the probability there are 12 or 13 girls?
for 12: 13C12*.5^12*.5^1 or 13/4096=0.0016
for 13: 1/4096=0.0001
Probability it is NOT those is 1-0.017 or 0.983

Answer by ikleyn(52787) (Show Source): You can put this solution on YOUR website!
.

The probability that at most 11 of the 13 babies are girls = = the COMPLEMENT to the probability that all babies are girls or 12 babies are girls = = 1 - - = 1 - - = 0.9983 = 99.83%.

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