If a group of 100 people has an average IQ of 107 and a group of 50 people has an average IQ of 101, the average IQ of all the people is 105.

Name: If a group of 100 people has an average IQ of 107 and a group of 50 people has an average IQ of 101, the average IQ of all the people is 105.
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Quizplus · Accepted Answer

This is true, as the average of the two groups weighted by their respective sizes is (100*107 + 50*101)/(100+50) = 105.

If a Group of 100 People Has an Average IQ