Question

If boys and girls are equally likely to be born, what is the probability that in a randomly selected family of 8 children, there will be at least one boy? (Find the answer using a formula. Give your answer correct to three decimal places.)

Answer 1

P( at least one boy) = 1-p(all girls)
1-(1/2)^ 8

1-1/256

(256-1)/256

= 255/256

= 0.996