EduSahara™ Worksheet

Question 1

1.

The scores obtained by 6 students in a test are given below. Find the mean score.
3

5

2

19

7

1

(i)

18
(ii)

4
(iii)

6

1
6
(iv)

1
(v)

19

Question 2

2.

(i)

3
(ii)

6
(iii)

4
(iv)

1
(v)

2

Question 3

3.

(i)

21
2
(ii)

65
6
(iii)

83
8
(iv)

87
8
(v)

85
8

Question 4

4.

(i)

25
4
(ii)

49
8
(iii)

37
6
(iv)

35
6
(v)

13
2

Question 5

5.

Given the mean of
10
samples as
4

7
10
,

what is the new mean if two samples
5
and
6
are added ?

(i)

21
4
(ii)

37
8
(iii)

31
6
(iv)

29
6
(v)

9
2

Question 6

6.

Given the mean of
12
samples as
5

7
12
,

what is the new mean if two samples
2
and
4
are removed ?

(i)

61
10
(ii)

63
10
(iii)

59
10
(iv)

49
8
(v)

73
12

Question 7

7.

Find the mean of all prime numbers between 40 and 60.

(i)

49
(ii)

243
5
(iii)

241
5
(iv)

339
7

Question 8

8.

Find the mean of all prime numbers between 10 and 70.

(i)

479
13
(ii)

183
5
(iii)

623
17
(iv)

551
15
(v)

553
15

Question 9

9.

Find the mean of first 6 multiples of 12.

(i)

39
(ii)

41
(iii)

45
(iv)

43
(v)

42

Question 10

10.

Find the mean of first 9 whole numbers.

(i)

4
(ii)

3
(iii)

6
(iv)

2
(v)

5

Question 11

11.

Find the mean of first 5 multiples of 13.

(i)

39
(ii)

40
(iii)

36
(iv)

42
(v)

38

Question 12

12.

Find the mean of the first 20 odd numbers.

(i)

20
(ii)

17
(iii)

21
(iv)

22
(v)

19

Question 13

13.

Find the mean of the first 20 even numbers.

(i)

21
(ii)

18
(iii)

23
(iv)

20
(v)

22

Question 14

14.

The marks obtained by 15 students in a test are given below. Find their mean marks.

13

43

26

28

10

34

13

47

18

1

15

18

50

15

41

(i)

126
5
(ii)

124
5
(iii)

76
3
(iv)

172
7
(v)

122
5

Question 15

15.

The marks obtained by 10 students in a test are given below. Find the mean of their marks when the marks of each student is increased by 3.

12

31

28

36

35

10

13

22

46

5

(i)

82
3
(ii)

134
5
(iii)

132
5
(iv)

186
7
(v)

136
5

Question 16

16.

The marks obtained by 10 students in a test are given below. Find the mean of their marks when the marks of each student is decreased by 6.

5

35

3

47

10

12

35

36

22

22

(i)

199
12
(ii)

135
8
(iii)

33
2
(iv)

167
10
(v)

169
10

Question 17

17.

The marks obtained by 11 students in a test are given below. Find the mean of their marks when the marks of each student is doubled.

26

9

19

7

29

44

33

16

45

36

25

(i)

576
11
(ii)

578
11
(iii)

682
13
(iv)

158
3
(v)

580
11

Question 18

18.

Heights of 14 students (in cm) are given below. Find the mean height.

127

146

151

134

140

165

161

143

149

135

164

129

128

138

(i)

1006
7

cm
(ii)

1007
7

cm
(iii)

1012
7

cm
(iv)

1005
7

cm
(v)

1019
7

cm

Question 19

19.

Heights of 14 plants (in cm) are given below. Find the mean height.

88

71

100

71

100

85

70

73

99

68

56

82

60

58

(i)

1081
14

cm
(ii)

1095
14

cm
(iii)

541
7

cm
(iv)

1109
14

cm
(v)

1083
14

cm

Question 20

20.

Ages of 15 students (in years) are given below. Find the mean age.

12

11

10

11

11

15

14

12

12

15

15

13

11

13

10

(i)

13

years
(ii)

40
3

years
(iii)

43
3

years
(iv)

37
3

years
(v)

38
3

years

Question 21

21.

Rainfall of 14 days (in mm) are given below. Find the mean rainfall.

8

8

14

12

10

14

14

14

11

15

9

15

10

7

(i)

25
2

mm
(ii)

27
2

mm
(iii)

23
2

mm
(iv)

12

mm

Question 22

22.

Scores of 14 students are given below. Find the mean score.

72

87

80

74

75

79

90

72

88

85

70

90

78

87

(i)

81
(ii)

161
2
(iii)

163
2
(iv)

165
2

Question 23

23.

Temperatures of 11 days (in °C) are given below. Find the mean temperature.

30

30

31

30

34

32

34

30

29

25

28

(i)

333
11

°C
(ii)

355
11

°C
(iii)

334
11

°C
(iv)

344
11

°C
(v)

335
11

°C

Question 24

24.

Weights of 13 students (in kg) are given below. Find the mean weight.

60

60

40

54

55

51

53

54

41

42

54

40

49

(i)

666
13

kg
(ii)

654
13

kg
(iii)

655
13

kg
(iv)

679
13

kg
(v)

653
13

kg

Question 25

25.

Daily wages of 14 labourers (in ₹) are given below. Find the mean wage.

426

426

304

401

371

321

499

455

440

437

404

438

474

389

(i)

₹

415.21
(ii)

₹

413.29
(iii)

₹

414.21
(iv)

₹

413.21
(v)

₹

413.36

Question 26

26.

The arithmetic mean of a + 2, a, and a - 2 is

(i)

a
(ii)

3a
(iii)

a + 2
(iv)

a - 2

Question 27

27.

The arithmetic mean of
38

22

8

21

43

14

50

26
is

(i)

27.75
(ii)

29.75
(iii)

26.75
(iv)

25.75
(v)

28.75

Question 28

28.

If the mean of
7
samples is
14
,

what is the new mean if
6
is added to each number.

(i)

18
(ii)

20
(iii)

21
(iv)

19
(v)

23

Question 29

29.

If the mean of
4
samples is
37

1
4
,

what is the new mean if
6
is subtracted from each number.

(i)

123
4
(ii)

127
4
(iii)

63
2
(iv)

187
6
(v)

125
4

Question 30

30.

If the mean of
7
samples is
18

1
7
,

what is the new mean if each number is multiplied by
6
.

(i)

546
5
(ii)

762
7
(iii)

326
3
(iv)

764
7
(v)

760
7

Question 31

31.

(i)

6
(ii)

5
(iii)

2
(iv)

7
(v)

4

Question 32

32.

(i)

13
(ii)

14
(iii)

11
(iv)

9
(v)

12

Question 33

33.

The mean of the below random sample is
23

7
10
.
Find the missing quantity.
45

x

27

27

12

15

24

19

27

29

(i)

11
(ii)

9
(iii)

12
(iv)

13
(v)

15

Assignment Key