87
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87. A score is 20.
4 score = 40 years... "4 score and 7 years ago", in the words of Abraham Lincoln, is 47 years.
As a score is 20 years, 4 score and 7 years equals 87 years.
Score is an old term meaning 20. Similarly, we still use dozen to mean 12 of anything. The most famouse example I know is when Abe Lincoln used "Four score and seven years ago" in a speech. It was a fancy way of saying 87 years. So 7 score of whatever you are counting would be 7x20=140 of them.
The mean is the arithmetic average. The average of 4 9 7 4 & 1 is 5