Problem-Solving and Data AnalysisVery hardMean of the remaining values
Problem-Solving and Data Analysis practice question
The mean of 5 numbers is 12. The mean of 3 of those numbers is 8. What is the mean of the other 2 numbers?
Answer: 18
The five sum to 60 and the three sum to 24, so the other two sum to 36 and their mean is 18.
Common wrong answers
- If you answered 4
- 4 is 12 − 8.
- If you answered 16
- 16 averages 12 and 20.
- If you answered 36
- 36 is the sum of the two numbers, not their mean.
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What is the value of x?
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