Find the average of the first 10 even numbers. MCQ with Answer and Explanation

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Find the average of the first 10 even numbers.

A. 11.5

B. 10

C. 12

D. 11

Answer: Option D

Solution (By JKSSB Mock Tests)

Sum of first 10 even numbers = 10×11=110 (since sum = n(n+1) for first n evens? Actually sum = 2+4+...+20 = 2*(1+2+...+10)=2*55=110). Average=110/10=11.

This question belongs to: Maths Average

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Practice More Average Questions

Question #1

The average weight of 6 boys is 50 kg. If a new boy weighing 60 kg joins, what is the new average?

A. 51 kg

B. 50.5 kg

C. 52 kg

D. 51.43 kg

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Correct Answer: Option D

Explanation:
Sum=6×50=300. New sum=300+60=360. New avg=360/7=51.43.

This question belongs to: Maths Average

Question #2

Average of 10 numbers 1280. If average of 6 is 1275, average of remaining 4?

A. 1290

B. 1287.5

C. 1286

D. 1285

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Correct Answer: Option B

Explanation:
Sum10=12800. Sum6=7650. Remaining=5150. Average=1287.5.

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Question #3

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

A. 66.67

B. 65

C. 68

D. 67

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Correct Answer: Option A

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

This question belongs to: Maths Average

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