P21615C 7Kid Family A Find the probability that Jack and Jil

P216#15C 7-Kid Family A) Find the probability, that Jack and Jill have least one girl. use 5DP. B) Find the probability that Jack and Jill have exactly three boys.

Solution

n=7

We use binomial distribution here. we assume p=q=0.5

Let x: number of girls

A) P(x>=1)=1-P(x=0)=1-0.007813=0.9921

B) three boys , so x=4 girls.

P(x=4) =0.2734