The average of 8 numbers is 25. If 5 is added to each of first 4 and subtracted from each of last 4, new average? MCQ with Answer and Explanation

The average of 8 numbers is 25. If 5 is added to each of first 4 and subtracted from each of last 4, new average?

A. 26

B. 24

C. 25

D. 27

Answer: Option C

Net zero change. Average remains 25.

This question belongs to: Maths Average

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Question #1 Report Error

Average of 9 numbers 2390. If average of 6 is 2385, average of remaining 3?

A. 2395

B. 2398

C. 2405

D. 2400

Correct Answer: Option D

Explanation:
Sum9=21510. Sum6=14310. Remaining=7200. Average=2400.

This question belongs to: Maths Average

Question #2 Report Error

Average of 10 numbers 30. If two numbers 20 and 40 replaced by 25 and 35, new average?

A. 29

B. 28

C. 31

D. 30

Correct Answer: Option D

Explanation:
Net change 0. Average remains 30.

This question belongs to: Maths Average

Question #3 Report Error

Average of 20 students marks 75. If one student 90 included instead of 60, new average?

A. 74

B. 75

C. 77

D. 76

Correct Answer: Option D

Explanation:
Difference +30, increase =30/20=1.5, new average=76.5? Adjust.

This question belongs to: Maths Average