Average (Arithmetic Mean): Definition, Formula, Examples & Practice MCQs

What is Average (Arithmetic Mean)?

👉 Simple words mein:
Average ya Arithmetic Mean ek aisa number hai jo batata hai ke group of numbers ka “central value” kya hai.

Formula:

Average (Mean)=Sum of all numbers​/ Total Number

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Easy Example:

Numbers = 10, 20, 30

Average=10+20+30/3=60

60/3

So, average = 20

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20 Practice MCQs on Average (Arithmetic Mean)

Basic Level (1–10)

1. The average of 4 and 6 is:
   a) 5
   b) 10
   c) 6
   d) 4
   Answer: a) 5
2. Find the mean of 2, 4, 6, 8.
   a) 4
   b) 5
   c) 6
   d) 7
   Answer: b) 5
3. The average of 10, 20, 30, 40 is:
   a) 25
   b) 20
   c) 30
   d) 35
   Answer: a) 25
4. If the mean of 7 and 13 is x, then x = ?
   a) 7
   b) 10
   c) 13
   d) 20
   Answer: b) 10
5. Average of first five natural numbers (1, 2, 3, 4, 5) is:
   a) 2
   b) 2.5
   c) 3
   d) 3.5
   Answer: c) 3
6. Mean of 50, 60, 70, 80, 90 is:
   a) 65
   b) 70
   c) 75
   d) 80
   Answer: b) 70
7. Average of 12, 15, 18, 21, 24 is:
   a) 18
   b) 17
   c) 16
   d) 20
   Answer: a) 18
8. Mean of 100, 200, 300, 400 is:
   a) 150
   b) 200
   c) 250
   d) 300
   Answer: c) 250
9. If average of 3 numbers is 15, their sum is:
   a) 30
   b) 45
   c) 60
   d) 75
   Answer: b) 45
10. Average of 5, 10, 15, 20, 25 is:
    a) 12
    b) 13
    c) 15
    d) 20
    Answer: c) 15

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Advance/Logical Level (11–20)

11. The mean of 4 numbers is 25. If one number is 30, then sum of remaining 3 numbers is:
    a) 70
    b) 80
    c) 90
    d) 100
    Answer: b) 70
12. Average age of 5 students is 20 years. If one new student joins and new average becomes 21, then age of new student is:
    a) 25
    b) 26
    c) 27
    d) 28
    Answer: c) 27
13. A batsman scores 50, 60, 70, 80 runs in 4 innings. What should he score in 5th innings to make his average 70?
    a) 90
    b) 100
    c) 110
    d) 120
    Answer: b) 100
14. Average of 8 numbers is 15. If one number is removed, new average becomes 14. The removed number is:
    a) 20
    b) 21
    c) 22
    d) 23
    Answer: c) 22
15. The average of 10 numbers is 30. If each number is multiplied by 2, then new average is:
    a) 30
    b) 60
    c) 90
    d) 120
    Answer: b) 60
16. The mean of 1, 2, 3, …, 100 is:
    a) 49
    b) 50
    c) 50.5
    d) 51
    Answer: c) 50.5
17. Average of 5 consecutive odd numbers is 35. The largest number is:
    a) 37
    b) 39
    c) 41
    d) 43
    Answer: b) 39
18. The average weight of 30 students is 50 kg. If teacher’s weight is included, average becomes 51. Teacher’s weight is:
    a) 60
    b) 75
    c) 80
    d) 81
    Answer: d) 81
19. A cricketer’s average in 10 matches is 40 runs. In the next match, he scores 90 runs. His new average is:
    a) 44
    b) 45
    c) 46
    d) 47
    Answer: a) 44
20. The average of two numbers is 18, and their sum is 36. The numbers are:
    a) 16 and 20
    b) 18 and 18
    c) 15 and 21
    d) 12 and 24
    Answer: b) 18 and 18