The average of 8 numbers is 12. If 4 is added to half of them and 4 subtracted from other half, new average? MCQ with Answer and Explanation

The average of 8 numbers is 12. If 4 is added to half of them and 4 subtracted from other half, new average?

A. 13

B. 14

C. 11

D. 12

Answer: Option D

Net change zero. Average remains 12.

This question belongs to: Maths Average

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Question #1 Report Error

The average of 5 numbers is 18. If one number is 25 and another is 15, find the average of the remaining 3 numbers.

A. 16

B. 17

C. 16.67

D. 18

Correct Answer: Option C

Explanation:
Sum=5×18=90. Sum of two=25+15=40. Sum of three=50. Average=50/3=16.67.

This question belongs to: Maths Average

Question #2 Report Error

The average of all natural numbers from 1 to 40 is

A. 19.5

B. 20.5

C. 21

D. 20

Correct Answer: Option B

Explanation:
(40+1)/2=20.5.

This question belongs to: Maths Average

Question #3 Report Error

Average of 12 numbers 920. If average of 8 is 915, average of remaining 4?

A. 925

B. 928

C. 932

D. 930

Correct Answer: Option D

Explanation:
Sum12=11040. Sum8=7320. Remaining=3720. Average=930.

This question belongs to: Maths Average