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. 20

C. 30

D. 23

Answer: Option D

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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Average of 10 numbers 1280. If average of 6 is 1275, average of remaining 4?

A. 1290

B. 1287.5

C. 1286

D. 1285

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Correct Answer: Option B

Explanation:
Sum10=12800. Sum6=7650. Remaining=5150. Average=1287.5.

This question belongs to: Maths Average

Question #2

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The average of 5 numbers is 40. If one number is 60, find the average of the remaining 4.

A. 35

B. 33.75

C. 36

D. 34

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Correct Answer: Option A

Explanation:
Sum=5×40=200. Remaining sum=200-60=140. Avg=140/4=35.

This question belongs to: Maths Average

Question #3

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The average marks of 18 students is 68. If a student with 82 marks joins, what is the new average?

A. 69.0

B. 68.2

C. 68.74

D. 68.5

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Correct Answer: Option C

Explanation:
Sum=18×68=1224. New sum=1224+82=1306. New avg=1306/19=68.74.

This question belongs to: Maths Average

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