If boys ad girls are equally likely to be born, what is the probability that in a randomly selected family of eight children, there will be at least one a boy. Answer 0.984
Your answer corresponds to at least one boy in a family of 6.
Retrace what you did and work it out for a family of 8.
"At least one boy" corresponds to "NOT all girls".
So calculate the probability of having all girls in the family, and subtract from 1.0 to get the probability of having at least one boy.