Question

The random variable X is the number of girls of four children born to a couple that is equally likely to have either a boy or a girl. Its probability distribution is as follows

Q24

(a) µ = E(X) = (Round your answer to one decimal place)

(b) σ(X) = (Round your answer to one decimal place)

c) Among all families with four children, what is the average number of boys?

(Round your answer to one decimal place)

Answer 1

c) Among all families with four children, what is the average number of boys?

Since the male and female birth are equally likely

So the average number of boys in all families with four children are same as average number of girls = 2

So answer is 2