Problem-Solving and Data AnalysisMediumNew mean after adding a value
Problem-Solving and Data Analysis practice question
Four numbers have a mean of 20. A fifth number, 30, is added to the set. What is the mean of the five numbers?
Answer: 22
The four sum to 80; adding 30 gives 110, and 110/5 = 22.
Common wrong answers
- If you answered 24
- 24 divides 120 by 5.
- If you answered 25
- 25 averages 20 and 30.
- If you answered 50
- 50 adds 20 and 30.
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