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. 52.125

B. 51.875

C. 50.875

D. 51.125

Answer: Option C

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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The average of 7 numbers is 50. If each number is increased by 5, what is the new average?

A. 45

B. 50

C. 60

D. 55

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Correct Answer: Option D

Explanation:
New average =50+5=55.

This question belongs to: Maths Average

Question #2

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Average of 9 consecutive odd numbers is 27. What is the smallest?

A. 21

B. 17

C. 23

D. 19

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Correct Answer: Option D

Explanation:
Middle=27. Smallest=27 -8=19.

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Question #3

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Average of 30 numbers 20. If each decreased by 4, new average?

A. 20

B. 18

C. 24

D. 16

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Correct Answer: Option D

Explanation:
16.

This question belongs to: Maths Average

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