Average of even numbers between 1 and 31 is MCQ with Answer and Explanation

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Average of even numbers between 1 and 31 is

A. 18

B. 15

C. 16

D. 17

Answer: Option C

Solution (By JKSSB Mock Tests)

2 to 30, 15 numbers. Average (2+30)/2=16.

This question belongs to: Maths Average

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Question #1

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Find the average of all numbers from 1 to 15 that are divisible by 3.

A. 10

B. 8

C. 12

D. 9

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Correct Answer: Option D

Explanation:
Numbers: 3,6,9,12,15 sum=45, count=5, avg=9.

This question belongs to: Maths Average

Question #2

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Average speed to cover a distance in two equal parts at speeds x and y is

A. 2xy/(x+y)

B. x+y

C. xy/(x+y)

D. (x+y)/2

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Correct Answer: Option A

Explanation:
Harmonic mean for equal distances.

This question belongs to: Maths Average

Question #3

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The average age of 6 children is 10 years. If the age of one child is 8, find the average age of the remaining 5.

A. 10

B. 11

C. 10.4

D. 9.6

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Correct Answer: Option C

Explanation:
Sum=6×10=60. Remaining sum=60-8=52. Avg=52/5=10.4.

This question belongs to: Maths Average

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