Find the average of all even numbers between 1 and 20 (inclusive of 20). MCQ with Answer and Explanation

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Find the average of all even numbers between 1 and 20 (inclusive of 20).

A. 12

B. 10

C. 11

D. 10.5

Answer: Option C

Solution (By JKSSB Mock Tests)

Even numbers: 2,4,...,20. Sum = 2+4+...+20 = 2×(1+2+...+10)=2×55=110. Count=10. Average=110/10=11.

This question belongs to: Maths Average

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Question #1

If the average of 6 numbers is 18 and average of 4 is 20, average of remaining 2 is

A. 14

B. 12

C. 15

D. 16

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Correct Answer: Option A

Explanation:
Sum6=108. Sum4=80. Remaining sum=28. Average=14.

This question belongs to: Maths Average

Question #2

The average of 9 numbers is 30. If each number is increased by 2, what is the new average?

A. 34

B. 32

C. 30

D. 28

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Correct Answer: Option B

Explanation:
New average =30+2=32.

This question belongs to: Maths Average

Question #3

Average of 12 numbers 220. If average of 8 is 215, average of remaining 4?

A. 228

B. 225

C. 230

D. 232

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Correct Answer: Option C

Explanation:
Sum12=2640. Sum8=1720. Remaining=920. Average=230.

This question belongs to: Maths Average

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