What is the average of the first 8 odd numbers? MCQ with Answer and Explanation

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What is the average of the first 8 odd numbers?

A. 8.5

B. 9

C. 8

D. 7.5

Answer: Option C

Solution (By JKSSB Mock Tests)

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

This question belongs to: Maths Average

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Question #1

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Average of 12 numbers 2620. If average of 8 is 2615, average of remaining 4?

A. 2628

B. 2625

C. 2630

D. 2632

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Correct Answer: Option C

Explanation:
Sum12=31440. Sum8=20920. Remaining=10520. Average=2630.

This question belongs to: Maths Average

Question #2

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The average marks of 18 students is 68. If a student with 82 marks joins, what is the new average?

A. 69.0

B. 68.74

C. 68.2

D. 68.5

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Correct Answer: Option B

Explanation:
Sum=18×68=1224. New sum=1224+82=1306. New avg=1306/19=68.74.

This question belongs to: Maths Average

Question #3

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What is the average of the first 9 odd numbers?

A. 9

B. 8.5

C. 10

D. 9.5

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Correct Answer: Option A

Explanation:
Sum of first n odd numbers = n^2 =9^2=81. Average=81/9=9.

This question belongs to: Maths Average

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