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Quantitative Aptitude

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Percentage & Averages

Question
2 out of 20
 

The average of 15 numbers is 42.2 later it is found that 3 numbers are wrongly added. First 42 less than the actual number second 21 instead of 12 and third 31 instead of 13.



A 40.2
B 41.2
C 45.2
D can’t determine
E None of these

Ans. B Error = (042) + (21-12) + (31-13)

= - 42 + 9 + 18 = -15

So impact on avg. =

So average will be 42.2 – 1 = 41.2

Percentage & Averages Flashcard List

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