Worldwide there are more boys than girls. It is believed that for every 100 girls born, 107 boys are born. Over time, the populations even out a bit due to differing factors, for example war, accidents etc.
Due to populations being measured in millions, the chance of having exactly the same number of each is highly unlikely. Studies over the years have seen some trends in certain parts for the world. Caribbean countries like Barbados, Haiti and Aruba have tended to have more girls than boys. China and India tend to have more boys than girls. Central African countries like Zambia and DPR Congo tend to have a split closer to 50/50.
For a video explanation, please see below.
If you would like to learn more about populations please see the below book(links to Amazon).