The average of 40 observations is 52. If one observation was recorded as 72 instead of 27, the correct average is: MCQ with Answer and Explanation

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The average of 40 observations is 52. If one observation was recorded as 72 instead of 27, the correct average is:

A. 50.875

B. 51.125

C. 52.125

D. 51.875

Answer: Option A

Solution (By JKSSB Mock Tests)

Recorded total = 40×52 = 2080. Correct total = 2080−72+27 = 2035. Correct average = 2035/40 = 50.875.

This question belongs to: Maths Average

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Question #1

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Average of 14 numbers 40. If average of 8 is 36, average of remaining 6?

A. 48

B. 46

C. 45

D. 44

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Correct Answer: Option B

Explanation:
Sum14=560. Sum8=288. Remaining=272. Average≈45.33 approx 46.

This question belongs to: Maths Average

Question #2

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The average of 63,72,81 is

A. 72

B. 70

C. 75

D. 68

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Correct Answer: Option A

Explanation:
216/3=72.

This question belongs to: Maths Average

Question #3

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Find the average of the first 5 multiples of 6.

A. 15

B. 16

C. 18

D. 20

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Correct Answer: Option C

Explanation:
Multiples:6,12,18,24,30 sum=90, count=5, avg=18.

This question belongs to: Maths Average

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