Average of 50 numbers is 38. The number 45 was wrongly written as 54. Correct average? MCQ with Answer and Explanation

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Average of 50 numbers is 38. The number 45 was wrongly written as 54. Correct average?

A. 37.8

B. 37.82

C. 39

D. 38

Answer: Option B

Solution (By JKSSB Mock Tests)

Error +9, decrease 9/50=0.18, correct average=38-0.18=37.82.

This question belongs to: Maths Average

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Practice More Average Questions

Question #1

Average of 1575,2100,2625 is

A. 2100

B. 2090

C. 2095

D. 2110

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Correct Answer: Option A

Explanation:
6300/3=2100.

This question belongs to: Maths Average

Question #2

Average of 8 numbers 2300. If average of 5 is 2295, average of remaining 3?

A. 2307

B. 2308.33

C. 2305

D. 2310

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Correct Answer: Option B

Explanation:
Sum8=18400. Sum5=11475. Remaining=6925. Average≈2308.33.

This question belongs to: Maths Average

Question #3

Find the average of first 10 natural numbers.

A. 5

B. 6

C. 5.5

D. 6.5

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Correct Answer: Option C

Explanation:
Sum of first 10 natural numbers = 10×11/2 = 55. Average = 55/10 = 5.5.

This question belongs to: Maths Average

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