Question

Assume that the probability that a baby will be a boy is 0.6. Calculate the probabilities that the first two children in the family will be i) boys ii)of the same sex?

Answer 1

i)0.36
ii) 0.52

Explanation:

If they are both boys `P(B nn B)=0.6 xx 0.6 =0.36`

If the same sex that is both boys or both girls.
P(Girl)=1-0.6=0.4

`P(G nn G) =0.4 xx 0.4 = 0.16`

P(Same sex)=0.36+0.16=0.52