What is the average of the first 9 odd numbers? MCQ with Answer and Explanation

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What is the average of the first 9 odd numbers?

A. 9.5

B. 9

C. 10

D. 8.5

Answer: Option B

Solution (By JKSSB Mock Tests)

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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Question #1

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Average of 12 numbers 1970. If average of 8 is 1965, average of remaining 4?

A. 1975

B. 1980

C. 1978

D. 1982

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Correct Answer: Option B

Explanation:
Sum12=23640. Sum8=15720. Remaining=7920. Average=1980.

This question belongs to: Maths Average

Question #2

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Average of 8 numbers 1050. If average of 5 is 1045, average of remaining 3?

A. 1058.33

B. 1060

C. 1057

D. 1055

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Correct Answer: Option A

Explanation:
Sum8=8400. Sum5=5225. Remaining=3175. Average≈1058.33.

This question belongs to: Maths Average

Question #3

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Average of 15 numbers 1410. If average of 9 is 1405, average of remaining 6?

A. 1417.5

B. 1420

C. 1415

D. 1418

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Correct Answer: Option A

Explanation:
Sum15=21150. Sum9=12645. Remaining=8505. Average=1417.5.

This question belongs to: Maths Average

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