Question 49
MediumOriginal questionThe average weight of 10 people increases by 1.5 kg when one of them, who weighs 58 kg, is replaced by a new person. What is the weight of the new person?
Show the answer and explanation
CorrectNot quiteAnswer D
Correct answer: D
Explanation
The total rises by kg.
So the new person weighs 15 kg more than the one replaced: kg.
Worth noting
The rise is spread over all 10 people. Adding just 1.5 kg gives 59.5 kg; subtracting 15 gives 43 kg.
- Concept
- Value of a replacement from the change in average
- Typical timeTypical
- 50 s
- Your timeYours
- —
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