Average of 1,3,5,...,19 (odd numbers). MCQ with Answer and Explanation

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Average of 1,3,5,...,19 (odd numbers).

A. 12

B. 10

C. 11

D. 9

Answer: Option B

Solution (By JKSSB Mock Tests)

10 terms, average 10.

This question belongs to: Maths Average

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Question #1

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Average of 20 numbers 70. If 5 numbers average 80, average of remaining 15?

A. 67

B. 65

C. 68

D. 66.67

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Correct Answer: Option D

Explanation:
Total=1400. 5=400. Remaining=1000/15≈66.67.

This question belongs to: Maths Average

Question #2

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

A. 38

B. 37.8

C. 39

D. 37.82

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Correct Answer: Option D

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

This question belongs to: Maths Average

Question #3

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The average of 4 numbers is 28. If one number is 32, find the average of the remaining 3.

A. 27

B. 26.67

C. 28

D. 26

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Correct Answer: Option B

Explanation:
Sum=4×28=112. Remaining sum=112-32=80. Avg=80/3=26.67.

This question belongs to: Maths Average

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