alleryThree numbers have mean 10 and two others have mean 15. The mean of all five is?
A12
B25
C12.5
D13
Answer & Solution
Correct answer: A. 12
1. First three add to 30; the other two add to 30.
2. All five add to 60.
3. 60 / 5 = 12.
_Source: Wikipedia, Average (CC BY-SA 4.0), Average_
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