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1. Find the average of first ten natural numbers.

(a) 4.5

(b) 5.2

(c) 5.5

(d) 5.8


2. What is the average of the following numbers? 12, 8, 19, 15 and 13

(a) 13.4

(b) 12.8

(c) 14.2

(d) 12.4


3. The average of 49, 37, 56 and 43 is

(a) 45.75

(b) 48.50

(c) 47.75

(d) 46.25


4. What is the average of 4.2, 3.7, 5.8 and 7.6?

(a) 5.25

(b) 6.225

(c) 5.325

(d) 6.425


5. What is the average of 13.8, 19.6, 27.4, 9.5 and 18.7?

(a) 17.8

(b) 16.4

(c) 18.2

(d) 17.5


6. Find the average of 23.79, 47.83 and 58.64.

(a) 41.76

(b) 42.58

(c) 43.42

(d) 44.28


7. Find the average of 137, 504, 468 and 329.

(a) 358.25

(b) 359.5

(c) 357.75

(d) 360.25


8. The average of 148.6, 86.4, 236.3, 160.9 and 324.5 is

(a) 183.34

(b) 187.26

(c) 189.54

(d) 191.34


9. The heights of four students are 148 cm, 168 cm, 156 cm and 160 cm. Find the average height of the students.

(a) 158 cm

(b) 156.5 cm

(c) 156 cm

(d) 155.5 cm


10. The weights of three students are 48.5 kg, 52 kg and 57 kg. Find the average weight of the students.

(a) 52.5 kg

(b) 53 kg

(c) 53.5 kg

(d) 54 kg


11. Find the average of the first four prime numbers.

(a) 2.75

(b) 4.25

(c) 3.75

(d) 5.25


12. Find the average of the first eight prime numbers.

(a) 8.125

(b) 8.625

(c) 9.625

(d) 9.125


13. Find the average of all the prime numbers lying between 30 and 50.

(a) 39.8

(b) 38.6

(c) 40.2

(d) 36.4


14. Find the average of all the prime numbers lying between 70 and 100.

(a) 82.4

(b) 86.8

(c) 83.6

(d) 82


15. What is the average of first seven odd numbers?

(a) 6.5

(b) 7.5

(c) 8

(d) 7


16. What is the average of first twenty odd numbers?

(a) 18.5

(b) 21

(c) 20

(d) 20.5


17. Find the average of first eight even numbers.

(a) 8

(b) 4.5

(c) 9

(d) 9.5


18. Find the average of first fifty even natural numbers.

(a) 50

(b) 51

(c) 25.5

(d) 50.5


19. Find the average of first seven natural numbers.

(a) 4

(b) 7

(c) 8

(d) 7.5


20. Find the average of first one hundred natural numbers.

(d) 101

(a) 49.5

(b) 50.5

(c) 100


21. The marks of a student in English, Mathematics, Physics and Chemistry are respectively 59, 82, 76 and 43. Find his average marks.

(a) 62

(b) 68

(c) 65

(d) 64


22. In a family of five members, the age of father is 42 years, that of the mother is 38 years and the sum of the ages of the three children is 49 years. Find the average age of the family.

(a) 24.4 years

(c) 25.8 years

(b) 26.2 years

(d) 25.4 years


23. What is the average of the first six composite numbers?

(a) 7.34

(b) 9.36

(c) 7.84

(d) 8.16


24. Find the average of the first six multiples of six.

(d) 21

(a) 19

(b) 18

(c) 20


25. What is the average of the first seven multiples of 14?

(a) 52

(b) 54

(c) 56

(d) 58


26. What is the average of the first twelve counting numbers?

(a) 12

(b) 13

(c) 12.5

(d) 6.5


27. What is the average of all the even numbers from 40 to 50?

(d) 47

(a) 44

(b) 45

(c) 46


28. What is the average of all the odd numbers from 25 to 35?

(d) 31

(a) 28

(b) 29

(c) 30


29. What is the average of all the even numbers lying between 60 and 70?

(a) 64

(b) 64.5

(c) 65.5

(d) 65


30. What is the average of all the odd numbers lying between 40 and 557

(a) 46

(b) 46.5

(c) 47.5

(d) 47


31. Find the average of all the multiples of twelve lying between 60 and 160.

(a) 110

(b) 112

(c) 114

(d) 116


32. The average weight of 16 boys in a class is 50.25 kg and that of the remaining 8 boys is 45.15 kg. Find the average weight of all the boys in the class.

(a) 47.55 kg

(c) 48.55 kg

(b) 48 kg

(d) 49.25 kg


33. Average of 20 results is 18. If 3 is subtracted from each result, then what will be the new average? [Sainik School 2020]

(a) 21

(b) 15

(c) 16

(d) 17


34. The average age of a class of 40 students is 18 years. When the teacher's age is also included, then the average age becomes 19 years. What is the teacher's age?

[Sainik School 2019]

(a)59 years 

(b)69 years 

(c)49 years 

(d) 39 years


35. In a cricket series of 5 matches, Virat scored 64, 124, 92, 5 and 57 runs respectively. Find his average score per match.

(a) 64.6

(b) 72.8

(c) 68.6

(d) 68.4


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36. The prices of five articles are ₹542,₹436,₹625,₹324 and ₹467 respectively. Find the average price per article.

(a) ₹438.40

(c) ₹478.80

(b) ₹484.50

(d) ₹468.20


37. A car covers 50 km, 72 km, 58 km and 84 km distances respectively during four successive hours. Find the average speed of the car per hour.

(a) 64 km

(b) 66 km

(c) 68 km

(d) 72 km


38. The ages of eight boys in a group are 17 years, 19 years, 16 years, 20 years, 19 years, 18 years, 22 years and 19 years respectively. What is the average age per boy?

(a) 18.75 years

(c) 18.25 years

(b) 19.25 years

(d) 19.75 years


39. The lengths of 4 pieces of a cloth are 15 m 40 cm, 14 m 50 cm, 13 m 16 cm and 12 m 34 cm respectively. Find the average length per piece.

(a) 12 m 36 cm

(b) 13 m 85 cm

(c) 14 m 18 cm

(d) 13 m 28 cm


40. The heights of 5 girls in a group are 162 cm, 158 cm, 144 cm, 172 cm and 176 cm respectively. Find the mean height.

(a) 165.2 cm

(c) 164.8 cm

(b) 159.5 cm

(d) 162.4 cm


41. The rainfall at a place in the months of May, June, July and August was recorded as 74 cm, 69 cm, 59 cm and 94 cm respectively. Find the average rainfall at that place for these months.

(a) 72 cm

(b) 74 cm

(c) 75 cm

(d) 73 cm


42. The weights of three girls are 31.5 kg, 27.5 kg and 38.5 kg respectively. What is the average weight of these girls? 

(a) 32.5 kg 

(b) 31.5 kg 

(c) 30.5 kg 

(d) 33.5 kg


43. If the mean of 13, 12, x, 16 and 9 is 13, find the value of x.

(a) 15

(b) 13

(c) 16

(d) 14


44. The mean of 14, 12, x+5, 2x-3, 17 and 18 is 15. Find the value of x.

(a) 8

(b) 13

(c) 7

(d) 9


45. Find the arithmetic mean of the following numbers.67, 94, 58, 103 and 128

(a) 85

(b) 88

(c) 90

(d) 92


46. The number of children in 10 families of a locality are as follows: 3, 5, 0, 4, 1, 3, 2, 2, 4 and 2. Find the mean number of children per family.

(a) 2.6

(b) 3.1

(c) 2.4

(d) 2.5


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47. The marks of 7 students in an examination are 23, 29, 28, 21, 30, 35 and 30 respectively. What is the mean marks?

(a) 26

(b) 27

(c) 28

(d) 29


48. The average of fifteen numbers is 65. Find their sum.

(d) 995

(a) 965

(b) 975

(c) 985


49. The arithmetic mean of 36, 24, 2x + 1, 3x-1 and 45 is 39. Find the value x.

(a) 16

(b) 18

(c) 17

(d) 19


50. The average of five numbers is 75. If the sum of the first four numbers is 343, then the fifth number is

(a) 32

(b) 56

(c) 42

(d) 66


Answer- 1-c  2-a  3-d  4-c  5-a  6-c  7-b  8-d  9-a  10-a  11-b  12-c  13-a  14-d  15-d 16-c  17-c  18-b  19-a  20-b   21-c    22-c   23-d   24-d  25-c  26-d  27-b  28-c  29-d   30- d 31-c  32-c  33-b  34-a  35-d  36-c  37-b   38-a   39-b   40-d    41-b  42-a  43-a  44-d  45-c  46-a  47-c  48-b  49-b  50-a