The average of 50 numbers is 38. If 48 is replaced by 78, new average? MCQ with Answer and Explanation

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The average of 50 numbers is 38. If 48 is replaced by 78, new average?

A. 38.6

B. 38

C. 39

D. 37

Answer: Option A

Solution (By JKSSB Mock Tests)

Change +30, increase 30/50=0.6. New=38.6.

This question belongs to: Maths Average

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Question #1

Average of 15 numbers 50. If average of 10 is 55, average of remaining 5?

A. 40

B. 42

C. 45

D. 35

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Correct Answer: Option A

Explanation:
Sum15=750. Sum10=550. Remaining=200. Average=40.

This question belongs to: Maths Average

Question #2

Average of 15 numbers 910. If average of 9 is 905, average of remaining 6?

A. 918

B. 920

C. 915

D. 917.5

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Correct Answer: Option D

Explanation:
Sum15=13650. Sum9=8145. Remaining=5505. Average=917.5.

This question belongs to: Maths Average

Question #3

The average marks of 12 students is 72. If a student with 88 marks leaves, what is the new average?

A. 70

B. 70.55

C. 71.5

D. 71

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Correct Answer: Option B

Explanation:
Sum=12×72=864. New sum=864-88=776. New avg=776/11=70.545≈70.55.

This question belongs to: Maths Average

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