The average of 9 numbers is 27. If one number is wrongly taken as 45 instead of 27, the incorrect average is: MCQ with Answer and Explanation

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The average of 9 numbers is 27. If one number is wrongly taken as 45 instead of 27, the incorrect average is:

A. 28

B. 30

C. 29

D. 31

Answer: Option C

Solution (By JKSSB Mock Tests)

Correct total = 9×27 = 243. Incorrect total = 243+18 = 261. Incorrect average = 261/9 = 29.

This question belongs to: Maths Average

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Question #1

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Average of 8 numbers 1100. If average of 5 is 1095, average of remaining 3?

A. 1105

B. 1108.33

C. 1110

D. 1107

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Correct Answer: Option B

Explanation:
Sum8=8800. Sum5=5475. Remaining=3325. Average≈1108.33.

This question belongs to: Maths Average

Question #2

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Average of 12 numbers 820. If average of 8 is 815, average of remaining 4?

A. 828

B. 830

C. 825

D. 832

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Correct Answer: Option B

Explanation:
Sum12=9840. Sum8=6520. Remaining=3320. Average=830.

This question belongs to: Maths Average

Question #3

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Average of 40 numbers 28. If 10 numbers average 32, average of remaining 30?

A. 27

B. 26

C. 25

D. 24

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Correct Answer: Option B

Explanation:
Total=1120. 10=320. Remaining=800/30≈26.67 approx 26.

This question belongs to: Maths Average

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