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

Question

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Average of all prime numbers between 10 and 30 is

A. 21

B. 18

C. 19.5

D. 20

Answer: Option C

Solution (By JKSSB Mock Tests)

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

This question belongs to: Maths Average

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Question #1

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If average of 15 numbers is 50 and average of 5 is 55, average of remaining 10?

A. 45

B. 47.5

C. 48

D. 50

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Correct Answer: Option B

Explanation:
Sum15=750. Sum5=275. Remaining=475. Average=47.5.

This question belongs to: Maths Average

Question #2

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The average of 6 numbers is 21. If one number is 15, find the average of the remaining 5.

A. 21.4

B. 21.6

C. 22

D. 22.2

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Correct Answer: Option D

Explanation:
Sum=6×21=126. Remaining sum=126-15=111. Avg=111/5=22.2.

This question belongs to: Maths Average

Question #3

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The average of 8,16,24,32,40 is

A. 22

B. 26

C. 25

D. 24

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Correct Answer: Option D

Explanation:
Sum=120. Average=24.

This question belongs to: Maths Average

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