Averages MCQs Quiz (30 Questions) for TLT, ECT, PST, JEST Exam | Mathematics

Averages — MCQs Quiz

Subject: Mathematics  |  Topic: Averages (30 MCQs)

For TLT, ECT, PST, JEST & All Competitive Exams

Test your understanding of Averages with this interactive 30-MCQ quiz — covering the average formula, finding missing values, combined averages, and the effect of adding new values. Every answer has been calculated and verified. Select your answer for each question, then click Submit at the end to instantly see your score.

Instructions: Select one option for each question. After answering all questions, click the Submit button below to see your obtained marks and correct/incorrect answers.

1. What is the formula for calculating average?

Sum × Count Sum / Count Count / Sum Sum + Count

2. Find the average of 10, 20, and 30.

15 20 25 30

3. The average of 4 numbers is 15. Find their sum.

45 50 60 75

4. The average of 5 numbers is 18. If four of them are 10, 15, 20, and 25, find the fifth number.

15 20 25 30

5. The average marks of 10 students is 50. A new student joins with 72 marks. Find the new average.

51 52 53 54

6. Find the average of 8, 12, 16, and 20.

12 13 14 14

7. The average of 3 numbers is 25. Find their sum.

65 70 75 80

8. The average height of 10 students is 150 cm, and the average height of another 5 students is 160 cm. Find the average height of all 15 students.

152 cm 153.33 cm 154 cm 155 cm

9. Find the average of 5, 10, 15, 20, and 25.

12 15 18 20

10. The average of 6 numbers is 12. Find their sum.

60 66 72 78

11. The average of 4 numbers is 20. If three of them are 15, 22, and 25, find the fourth number.

16 18 20 22

12. The average weight of 8 boys is 45 kg. A new boy joins with 63 kg weight. Find the new average.

46 kg 47 kg 48 kg 49 kg

13. Find the average of 2, 4, 6, 8, and 10.

5 6 7 8

14. The average of 7 numbers is 10. Find their sum.

60 65 70 75

15. The average of two numbers is 15. If one number is 10, find the other number.

18 20 22 25

16. The average score of 15 students is 70. A new student joins with a score of 86. Find the new average.

70 71 72 73

17. Find the average of 100, 200, and 300.

150 175 200 225

18. The average of 5 consecutive numbers starting from 6 (6, 7, 8, 9, 10) is:

7 8 9 10

19. The average of 10 numbers is 25. If each number is increased by 5, what is the new average?

25 27 30 35

20. The average of 6 numbers is 18. If each number is doubled, what is the new average?

18 24 30 36

21. The average of 8 numbers is 20. Find their sum.

140 150 160 170

22. The average of 12, 15, 18, and x is 20. Find x.

25 30 35 40

23. The average temperature of 5 days is 30°C. If the average of the first 4 days is 28°C, find the temperature on the 5th day.

36°C 38°C 40°C 42°C

24. If the average of 20 numbers is 0, how many of the numbers can be non-zero?

None, all must be zero Some can be non-zero, as long as they cancel out Only 1 can be non-zero All must be negative

25. Find the average of 50, 60, 70, 80, and 90.

60 65 70 75

26. The average of 9 numbers is 40. Find their sum.

340 350 360 370

27. The average of 4 numbers is 25. If one number is removed, the average of the remaining 3 becomes 20. Find the removed number.

35 38 40 42

28. The average of 3 numbers is 40. Two of the numbers are 30 and 45. Find the third number.

40 42 45 48

29. What happens to the average if all values in a data set are equal?

The average equals that common value The average becomes zero The average cannot be found The average becomes infinite

30. Which of the following correctly describes "Average" in Mathematics?

The largest value in a data set The smallest value in a data set A value representing the central tendency of a data set The number of values in a data set

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