What is the average of the first 4 prime numbers? MCQ with Answer and Explanation

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What is the average of the first 4 prime numbers?

A. 5

B. 4.0

C. 4.5

D. 4.25

Answer: Option D

Solution (By JKSSB Mock Tests)

Primes:2,3,5,7 sum=17, avg=17/4=4.25.

This question belongs to: Maths Average

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Question #1

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The average of 6 numbers is 25. If 5 numbers average 24, the 6th is

A. 29

B. 28

C. 30

D. 26

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Correct Answer: Option A

Explanation:
6th =150 -120=30? Sum6=150. 5*24=120. 30.

This question belongs to: Maths Average

Question #2

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If average of a,b,c is 25, b=20, average of a,c?

A. 27.5

B. 30

C. 22.5

D. 25

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Correct Answer: Option A

Explanation:
a+c=75-20=55. Average=27.5.

This question belongs to: Maths Average

Question #3

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If average of 4 numbers is 25 and three numbers 20,25,35, fourth?

A. 30

B. 15

C. 20

D. 25

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Correct Answer: Option C

Explanation:
Fourth=100 -80=20.

This question belongs to: Maths Average

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