The average of 15 observations is 20. If each observation is increased by 3, what is the new average? MCQ with Answer and Explanation

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The average of 15 observations is 20. If each observation is increased by 3, what is the new average?

A. 17

B. 23

C. 30

D. 20

Answer: Option B

Solution (By JKSSB Mock Tests)

New average = old average + increase =20+3=23.

This question belongs to: Maths Average

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Question #1

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The average of 3 numbers is 18. If two of the numbers are 15 and 20, find the third number.

A. 18

B. 19

C. 20

D. 17

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Correct Answer: Option B

Explanation:
Sum of 3 numbers = 3×18=54. Sum of two =15+20=35. Third =54-35=19.

This question belongs to: Maths Average

Question #2

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The average of 8 numbers is 25. If 5 is added to each of first 4 and subtracted from each of last 4, new average?

A. 27

B. 24

C. 25

D. 26

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Correct Answer: Option C

Explanation:
Net zero change. Average remains 25.

This question belongs to: Maths Average

Question #3

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The average of 600,800,1000 is

A. 800

B. 795

C. 810

D. 790

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Correct Answer: Option A

Explanation:
2400/3=800.

This question belongs to: Maths Average

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