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. 31

B. 29

C. 28

D. 30

Answer: Option B

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 16 numbers 80. If average of 10 is 75, average of remaining 6?

A. 90

B. 88.33

C. 87

D. 85

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Correct Answer: Option B

Explanation:
Sum16=1280. Sum10=750. Remaining=530. Average≈88.33.

This question belongs to: Maths Average

Question #2

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The average of 210,280,350 is

A. 280

B. 275

C. 270

D. 290

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Correct Answer: Option A

Explanation:
840/3=280.

This question belongs to: Maths Average

Question #3

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Average of 15 numbers is 40. Average of first 8 is 35. Average of last 8 is 45. Find the 8th number.

A. 45

B. 42

C. 35

D. 40

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Correct Answer: Option D

Explanation:
Sum15=600. Sum first8=280. Sum last8=360. 8th =280 +360 -600 =40.

This question belongs to: Maths Average

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