The total population of the earth was estimated to be 6.42 billion people.Given that the total land surface area of the earth is about 1.5×10^8km^2.Find the average number of people living in 1 km^2 of land on earth,correct to 2 significant figures.Thanks a lot for helping me!!^^

(6.42)/(1.5 x 10^8)=4.3 x 10^-8???

I think so....

Yeah..same as my answer sheet !thanks:)

To find the average number of people living in 1 km^2 of land on earth, we need to divide the total population by the total land surface area.

First, let's convert the land surface area from km^2 to m^2 by multiplying it by 1,000,000 (since there are 1,000,000 square meters in a square kilometer):
1.5 × 10^8 km^2 × 1,000,000 m^2/km^2 = 1.5 × 10^14 m^2

Now, we can calculate the average number of people per 1 km^2 of land by dividing the total population by the total land surface area:
Average number of people per km^2 = 6.42 × 10^9 / 1.5 × 10^14
= 4.28 × 10^(-5)

Rounded to 2 significant figures, the average number of people living in 1 km^2 of land on earth is 4.3.