​ 1. In a certain country, the probability that a baby that is born is a boy is 0.52 and the probably that a baby that is born is a girl is

Here is a part of the tree, you just have to get rid of the 0.5 probablities and repalce them with the correct ones.

I have already started it.

Multiply the probabilities on each of the branches to get the prob of each event happening.