The survey is an illustration of expected value
132 people in the survey were in the 21 - 30 year old group
How to determine the number of people in the group
From the complete question, 22% of people are in the 21 - 30 year old group
Given that 600 people were surveyed.
The number of people in the 21 - 30 year old group would be:
n = 22% * 600
This gives
n = 132
Hence, 132 people in the survey were in the 21 - 30 year old group
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