Average of 8 observations is 40. If two observations 30 and 50 are included, new average? MCQ with Answer and Explanation

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Average of 8 observations is 40. If two observations 30 and 50 are included, new average?

A. 42

B. 39

C. 41

D. 40

Answer: Option D

Solution (By JKSSB Mock Tests)

Sum8=320. New sum=320+80=400. Numbers10. Average=40.

This question belongs to: Maths Average

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Question #1

Average of 10 numbers 1580. If average of 6 is 1575, average of remaining 4?

A. 1587.5

B. 1586

C. 1590

D. 1585

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Correct Answer: Option A

Explanation:
Sum10=15800. Sum6=9450. Remaining=6350. Average=1587.5.

This question belongs to: Maths Average

Question #2

Average of 35,70,105 is

A. 60

B. 65

C. 80

D. 70

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Correct Answer: Option D

Explanation:
210/3=70.

This question belongs to: Maths Average

Question #3

The average age of a family of 5 members is 30 years. The youngest member is 5 years old. What is the average age of the remaining 4 members?

A. 36.25

B. 35

C. 37.5

D. 34

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Correct Answer: Option A

Explanation:
Sum of ages = 5×30=150. Sum of remaining 4 =150-5=145. Average =145/4=36.25.

This question belongs to: Maths Average

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