what was the world population around 1880?

score:3

Accepted answer

Simple linear interpolation would produce an estimate of 1,499,000,000.

1,265,000,000 +3/5*(1,656,000,000-1,265,000,000) = 1,499,600,000

Since we only have 4 significant figures in the input data, and an exponential curve is going to be a little under a straight line, we should round down the 6.

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