Average of 9 numbers is 50. If 60 is replaced by 40, new average? MCQ with Answer and Explanation

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Average of 9 numbers is 50. If 60 is replaced by 40, new average?

A. 48

B. 47

C. 50

D. 49

Answer: Option A

Solution (By JKExamLibrary)

Change -20, decrease 20/9≈2.22, 50-2.22≈47.78 approx 48.

This question belongs to: Maths Average

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Question #1 Report Error

Average of 15 numbers 1210. If average of 9 is 1205, average of remaining 6?

A. 1215

B. 1217.5

C. 1218

D. 1220

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Correct Answer: Option B

Explanation:
Sum15=18150. Sum9=10845. Remaining=7305. Average=1217.5.

This question belongs to: Maths Average

Question #2 Report Error

The average of 4 numbers is 12. If each number is multiplied by 2 and then 5 is added, what is the new average?

A. 24

B. 30

C. 27

D. 29

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Correct Answer: Option D

Explanation:
New average = (12×2)+5 =24+5=29.

This question belongs to: Maths Average

Question #3 Report Error

Average of 15 numbers 38. If one number 50 replaced by 20, new average?

A. 37

B. 36.67

C. 35

D. 36

View Answer & Solution Discuss

Correct Answer: Option B

Explanation:
Change -30, decrease 2. New≈36.

This question belongs to: Maths Average

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