Average of first 20 multiples of 5 is MCQ with Answer and Explanation

Average of first 20 multiples of 5 is

A. 50

B. 52.5

C. 55

D. 60

Answer: Option B

5 to 100. Average 5*(1+20)/2 =5*10.5=52.5.

This question belongs to: Maths Average

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Question #1 Report Error

Average of 9 consecutive even numbers is 30. Smallest?

A. 26

B. 22

C. 20

D. 24

Correct Answer: Option B

Explanation:
Middle 5th=30. Smallest=30-8=22.

This question belongs to: Maths Average

Question #2 Report Error

Average of 30 students 60 marks. If 10 students 70 marks, average of remaining 20?

A. 50

B. 58

C. 55

D. 52

Correct Answer: Option C

Explanation:
Total=1800. 10=700. Remaining=1100/20=55.

This question belongs to: Maths Average

Question #3 Report Error

The average of 40 observations is 52. If one observation was recorded as 72 instead of 27, the correct average is:

A. 50.875

B. 51.875

C. 52.125

D. 51.125

Correct Answer: Option A

Explanation:
Recorded total = 40×52 = 2080. Correct total = 2080−72+27 = 2035. Correct average = 2035/40 = 50.875.

This question belongs to: Maths Average