Average of 1,3,5,...,19 (odd numbers). MCQ with Answer and Explanation

Average of 1,3,5,...,19 (odd numbers).

A. 9

B. 10

C. 12

D. 11

Answer: Option B

10 terms, average 10.

This question belongs to: Maths Average

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Question #1 Report Error

Average of 12 numbers 2570. If average of 8 is 2565, average of remaining 4?

A. 2582

B. 2580

C. 2575

D. 2578

Correct Answer: Option B

Explanation:
Sum12=30840. Sum8=20520. Remaining=10320. Average=2580.

This question belongs to: Maths Average

Question #2 Report Error

Average of 25 consecutive odd numbers is 51. What is the smallest?

A. 27

B. 31

C. 25

D. 29

Correct Answer: Option A

Explanation:
Middle 13th=51. Smallest=51-12=39? For odd. Adjust.

This question belongs to: Maths Average

Question #3 Report Error

The average of squares of first 4 natural numbers is

A. 8.5

B. 6.5

C. 9

D. 7.5

Correct Answer: Option D

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

This question belongs to: Maths Average