In 2017, the total population of Africa was estimated to be about 1,250,000,000 people. This number, in billions, is:

1.25 billion.

Explanation:

As per the question, it is given that

The total population of Africa estimated is 1,250,000,000 people

As we know that

1,000,000,000 = 1 billion

For

1,250,000,000, it would be

= 1,250,000,000 ÷ 1,000,000,000

= 1.25 billion.

Hence,  the population in billions is 1.25 and the same is to be considered