Average of 10 numbers 680. If average of 6 is 675, average of remaining 4? MCQ with Answer and Explanation

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Average of 10 numbers 680. If average of 6 is 675, average of remaining 4?

A. 686

B. 687.5

C. 690

D. 685

Answer: Option B

Solution (By JKSSB Mock Tests)

Sum10=6800. Sum6=4050. Remaining=2750. Average=687.5.

This question belongs to: Maths Average

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Question #1

Average of 25 numbers is 36. If one number 48 is replaced by 24, new average?

A. 35

B. 36

C. 35.04

D. 34

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Correct Answer: Option C

Explanation:
Change -24, decrease 0.96, new≈35.04.

This question belongs to: Maths Average

Question #2

Average of all multiples of 10 from 10 to 100 is

A. 60

B. 50

C. 55

D. 45

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Correct Answer: Option C

Explanation:
10 numbers. Average=(10+100)/2=55.

This question belongs to: Maths Average

Question #3

Average of 15 numbers 2010. If average of 9 is 2005, average of remaining 6?

A. 2017.5

B. 2015

C. 2020

D. 2018

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Correct Answer: Option A

Explanation:
Sum15=30150. Sum9=18045. Remaining=12105. Average=2017.5.

This question belongs to: Maths Average

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