What is the average of cubes of first 3 natural numbers? MCQ with Answer and Explanation

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What is the average of cubes of first 3 natural numbers?

A. 27

B. 12

C. 36

D. 9

Answer: Option D

Solution (By JKSSB Mock Tests)

(1+8+27)/3=36/3=12? Wait, adjust: (1+8+27)=36, 36/3=12.

This question belongs to: Maths Average

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Question #1

Average of 50 and 60 is 55, average of 60 and 70 is 65, average of 50,60,70 is

A. 60

B. 58.33

C. 61

D. 59

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Correct Answer: Option A

Explanation:
Sum=180. Average=60.

This question belongs to: Maths Average

Question #2

What is the average of the first 8 odd numbers?

A. 9

B. 8

C. 7.5

D. 8.5

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Correct Answer: Option B

Explanation:
Sum of first n odd = n^2 =64. Average=64/8=8.

This question belongs to: Maths Average

Question #3

Average of 10 numbers 1080. If average of 6 is 1075, average of remaining 4?

A. 1085

B. 1086

C. 1090

D. 1087.5

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Correct Answer: Option D

Explanation:
Sum10=10800. Sum6=6450. Remaining=4350. Average=1087.5.

This question belongs to: Maths Average

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