Average of 1^3 +2^3 +...+5^3 is MCQ with Answer and Explanation

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Average of 1^3 +2^3 +...+5^3 is

A. 45

B. 55

C. 50

D. 225

Answer: Option A

Solution (By JKSSB Mock Tests)

Sum cubes =(5*6/2)^2=225. Average=225/5=45.

This question belongs to: Maths Average

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Question #1

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Average of 9 numbers 2690. If average of 6 is 2685, average of remaining 3?

A. 2700

B. 2698

C. 2695

D. 2705

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Correct Answer: Option A

Explanation:
Sum9=24210. Sum6=16110. Remaining=8100. Average=2700.

This question belongs to: Maths Average

Question #2

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The average of 10 numbers is increased by 2 when one number 15 is replaced by another. What is the new number?

A. 35

B. 30

C. 40

D. 25

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Correct Answer: Option A

Explanation:
Increase in sum =10×2=20. New number =15+20=35.

This question belongs to: Maths Average

Question #3

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Average of all multiples of 10 from 10 to 100 is

A. 60

B. 50

C. 45

D. 55

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Correct Answer: Option D

Explanation:
10 numbers. Average=(10+100)/2=55.

This question belongs to: Maths Average

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