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Driver-Less Cars with Certainty

I found this claim in a book:

A Motor Vehicle Bureau has revealed that in 1940 each car on the road contained an average of 3.2 persons. In 1950, occupancy had declined to 2.1 persons per car. By 1960, the average was down to 1.4 persons. If we project the statistics to 1980, every third car going by will have nobody in it.

Task 1: Try to explain the mathematics used in this statement...that is, what occurred in the "project the statistics" phase?

Task 2: Given this data set, what mathematics should be used to "project the statistics"?

Source: M. Bosstick & J. Cable, Patterns in the Sand, 1971, p. 208