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Averages and Mean

1 UPSC Prelims MCQs tagged "Averages and Mean". Free practice with answer keys, explanations, and timed mock tests on Anantam IAS.

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Arithmetic mean of 6 values is 4. If number 5 is found as incorrect…
Arithmetic mean of 6 values is 4. If number 5 is found as incorrect value in series and replaced with correct number as 17, then what will be the mean of new data series?
1. A4
2. B6
3. C8
4. D10
Answer and explanation
Correct answer: B
The original sum is 6 x 4 = 24. Swapping the wrong value 5 for the correct 17 changes the sum by +12, giving 36. The new mean is 36 / 6 = 6.
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CSAT UPSC GPSC-2026 Easy