How can half a person be born in a second?

Today in class we started our population and settlement. After a brief comment on not being a stenographer, we started the PowerPoint. The first slide was mainly statistics about the current amount of people on the planet (7 Billion is the current count) and about how many people were being born every second (We didn’t copy the statistics part but 2.5 people are born every  second). The next slide went over population growth in different places, and the current longstanding fact is that the countries that can afford to have more people the least have the most people, and vice versa. America and other developed countries (developed meaning having an infrastructure such as roads, a government, etc.) have actually leveled out on population growth. However, undeveloped countries such as Africa and parts of Asia have large population growth. Some developed countries are even instating population control by only allowing small amounts of children for each family. Our next slide went over life expectancy. Apparently, all over the world women live longer than men due to the fact that they take better care of themselves. Monaco has the highest expectancy rate due to it being a ‘playground’ for the rich, where richer people can afford better health care. The lowest expectancy rate is in Chad, where the average life expectancy is 49.81 years. The next slide was about measuring population, by using the crude birth and crude death rate to create an overall average.