Average of 21,42,63 is MCQ with Answer and Explanation

Average of 21,42,63 is

A. 42

B. 45

C. 35

D. 40

Answer: Option A

126/3=42.

This question belongs to: Maths Average

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Question #1 Report Error

Find the average of the first 5 composite numbers.

A. 7.6

B. 6.8

C. 7.4

D. 8

Correct Answer: Option C

Explanation:
First 5 composites: 4,6,8,9,10 sum=37, avg=37/5=7.4.

This question belongs to: Maths Average

Question #2 Report Error

Average of 7 numbers 50. If average of 4 is 45, average of remaining 3?

A. 55

B. 57.67

C. 60

D. 58

Correct Answer: Option B

Explanation:
Sum7=350. Sum4=180. Remaining=170. Average≈56.67 approx 57.

This question belongs to: Maths Average

Question #3 Report Error

The average of 40 observations is 52. If one observation was recorded as 72 instead of 27, the correct average is:

A. 51.875

B. 51.125

C. 50.875

D. 52.125

Correct Answer: Option C

Explanation:
Recorded total = 40×52 = 2080. Correct total = 2080−72+27 = 2035. Correct average = 2035/40 = 50.875.

This question belongs to: Maths Average