Question

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In standard form of a number we put decimal after first digit and remaining power is written as power of $10$

Given at the end of the $20_{th}$ century, the world population was approx $6.1×10_{9}$, which is standard form

So,

Population of people in usual form $=6.1×10_{9}=6100,000,000$.

Thus, the population of the people is six thousand one hundred million.

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