The average of first 9 natural numbers is: MCQ with Answer and Explanation

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The average of first 9 natural numbers is:

A. 5.5

B. 4

C. 5

D. 4.5

Answer: Option C

Solution (By JKSSB Mock Tests)

Average of first n natural numbers = (n+1)/2. For n=9, average = 5.

This question belongs to: Maths Average

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Practice More Average Questions

Question #1

Average of 825,1100,1375 is

A. 1110

B. 1095

C. 1090

D. 1100

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Correct Answer: Option D

Explanation:
3300/3=1100.

This question belongs to: Maths Average

Question #2

Average of 45,55,65 is

A. 52

B. 55

C. 50

D. 60

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Correct Answer: Option B

Explanation:
Sum=165. Average=55.

This question belongs to: Maths Average

Question #3

The average of 5 numbers is 28. If one number is excluded, the average becomes 25. What is the excluded number?

A. 30

B. 35

C. 45

D. 40

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Correct Answer: Option D

Explanation:
Sum of 5 numbers = 5 × 28 = 140. Sum of remaining 4 numbers = 4 × 25 = 100. Excluded number = 140 - 100 = 40.

This question belongs to: Maths Average

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