Average of all prime numbers between 10 and 30 is MCQ with Answer and Explanation

Question Report Error

Average of all prime numbers between 10 and 30 is

A. 21

B. 19.5

C. 18

D. 20

Answer: Option B

Solution (By JKExamLibrary)

11,13,17,19,23,29. Sum=112. Average=112/6≈18.67. Adjust.

This question belongs to: Maths Average

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Practice More Average Questions

Question #1 Report Error

Find the average of the first 7 natural numbers which are multiples of 2.

A. 9

B. 7

C. 8

D. 8.5

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Correct Answer: Option C

Explanation:
Multiples: 2,4,6,8,10,12,14 sum=56, count=7, avg=8.

This question belongs to: Maths Average

Question #2 Report Error

Average of 12 numbers is 40. If average of first 7 is 38, what is average of last 5?

A. 42

B. 40

C. 44

D. 43

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Correct Answer: Option D

Explanation:
Sum12=480. Sum first7=266. Sum last5=214. Average last5=42.8 ≈ but use exact numbers.

This question belongs to: Maths Average

Question #3 Report Error

Average marks of boys 60, girls 70, total average 65. Ratio boys:girls?

A. 3:1

B. 1:1

C. 2:1

D. 1:2

View Answer & Solution Discuss

Correct Answer: Option B

Explanation:
Let b,g. 60b +70g =65(b+g). 5g=5b. b=g.

This question belongs to: Maths Average

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