Question

The Wilson family was one of the first to come to the U.S. They had 9 children. Assuming that the probability of a child being a girl is .5, find the probability that the Wilson family had:

at least 5 girls?

at most 6 girls?

Answer 1

at least 5 girls
at most 6 girls

P(X=5)	=BINOM.DIST(5,9,0.5,FALSE)	0.2461
P(X=6)	=BINOM.DIST(6,9,0.5,FALSE)	0.1641
P(X=7)	=BINOM.DIST(7,9,0.5,FALSE)	0.0703
P(X=8)	=BINOM.DIST(8,9,0.5,FALSE)	0.0176
P(X=9)	=BINOM.DIST(9,9,0.5,FALSE)	0.0020

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