The average of squares of first 4 natural numbers is MCQ with Answer and Explanation

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The average of squares of first 4 natural numbers is

A. 9

B. 8.5

C. 6.5

D. 7.5

Answer: Option D

Solution (By JKSSB Mock Tests)

(1+4+9+16)/4=30/4=7.5.

This question belongs to: Maths Average

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Question #1

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Average of 25 numbers 70. If average of 15 is 75, average of remaining 10?

A. 60

B. 63

C. 62.5

D. 65

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Correct Answer: Option C

Explanation:
Total=1750. Sum15=1125. Remaining=625/10=62.5.

This question belongs to: Maths Average

Question #2

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The average of 6 numbers is 15. If each number is increased by 7, what is the new average?

A. 29

B. 8

C. 22

D. 15

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Correct Answer: Option C

Explanation:
New average =15+7=22.

This question belongs to: Maths Average

Question #3

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Average of 12 numbers 2770. If average of 8 is 2765, average of remaining 4?

A. 2778

B. 2775

C. 2780

D. 2782

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Correct Answer: Option C

Explanation:
Sum12=33240. Sum8=22120. Remaining=11120. Average=2780.

This question belongs to: Maths Average

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