EduSahara™ Worksheet

Question 1

1.

The scores obtained by 9 students in a test are given below. Find the mean score.
8

5

9

17

13

16

2

14

8

(i)

17
(ii)

2
(iii)

9
(iv)

15
(v)

10

2
9

Question 2

2.

(i)

12
(ii)

9
(iii)

11
(iv)

10
(v)

8

Question 3

3.

(i)

113
10
(ii)

89
8
(iii)

133
12
(iv)

111
10
(v)

109
10

Question 4

4.

(i)

9
(ii)

7
(iii)

12
(iv)

8
(v)

10

Question 5

5.

Given the mean of
10
samples as
6

1
2
,

what is the new mean if two samples
9
and
10
are added ?

(i)

6
(ii)

10
(iii)

5
(iv)

8
(v)

7

Question 6

6.

Given the mean of
12
samples as
4

7
12
,

what is the new mean if two samples
8
and
5
are removed ?

(i)

23
5
(ii)

29
7
(iii)

19
5
(iv)

21
5
(v)

13
3

Question 7

7.

Find the mean of all prime numbers between 40 and 70.

(i)

56
(ii)

53
(iii)

54
(iv)

52
(v)

50

Question 8

8.

Find the mean of all prime numbers between 20 and 90.

(i)

553
10
(ii)

443
8
(iii)

111
2
(iv)

441
8
(v)

445
8

Question 9

9.

Find the mean of first 7 multiples of 12.

(i)

48
(ii)

50
(iii)

46
(iv)

47
(v)

49

Question 10

10.

Find the mean of first 7 whole numbers.

(i)

4
(ii)

0
(iii)

6
(iv)

3
(v)

2

Question 11

11.

Find the mean of first 9 multiples of 20.

(i)

99
(ii)

102
(iii)

100
(iv)

101
(v)

98

Question 12

12.

Find the mean of the first 15 odd numbers.

(i)

15
(ii)

16
(iii)

14
(iv)

13
(v)

18

Question 13

13.

Find the mean of the first 20 even numbers.

(i)

21
(ii)

22
(iii)

18
(iv)

20
(v)

23

Question 14

14.

The marks obtained by 13 students in a test are given below. Find their mean marks.

17

36

48

12

48

41

50

34

25

23

41

2

3

(i)

146
5
(ii)

378
13
(iii)

322
11
(iv)

382
13
(v)

380
13

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 4.

5

37

19

21

8

34

9

46

23

21

(i)

105
4
(ii)

263
10
(iii)

211
8
(iv)

261
10
(v)

53
2

Question 16

16.

The marks obtained by 14 students in a test are given below. Find the mean of their marks when the marks of each student is decreased by 6.

16

27

7

1

47

26

32

39

34

17

12

19

49

22

(i)

130
7
(ii)

134
7
(iii)

56
3
(iv)

132
7
(v)

96
5

Question 17

17.

The marks obtained by 15 students in a test are given below. Find the mean of their marks when the marks of each student is doubled.

35

34

2

3

35

33

47

37

21

44

31

6

29

40

6

(i)

912
17
(ii)

700
13
(iii)

268
5
(iv)

806
15
(v)

808
15

Question 18

18.

Heights of 11 students (in cm) are given below. Find the mean height.

142

140

153

165

162

154

137

144

125

168

156

(i)

1647
11

cm
(ii)

1646
11

cm
(iii)

1657
11

cm
(iv)

1668
11

cm
(v)

1648
11

cm

Question 19

19.

Heights of 12 plants (in cm) are given below. Find the mean height.

71

93

78

96

91

82

64

89

89

86

61

94

(i)

83

cm
(ii)

499
6

cm
(iii)

503
6

cm
(iv)

497
6

cm
(v)

509
6

cm

Question 20

20.

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

14

11

10

15

15

11

15

10

12

12

11

13

11

12

14

(i)

63
5

years
(ii)

67
5

years
(iii)

72
5

years
(iv)

62
5

years
(v)

64
5

years

Question 21

21.

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

6

5

12

15

13

14

9

12

6

5

11

12

8

5

(i)

23
2

mm
(ii)

19
2

mm
(iii)

10

mm
(iv)

21
2

mm

Question 22

22.

Scores of 12 students are given below. Find the mean score.

84

86

89

77

80

72

84

70

78

80

79

84

(i)

329
4
(ii)

325
4
(iii)

161
2
(iv)

321
4
(v)

323
4

Question 23

23.

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

27

31

35

29

28

35

34

29

28

31

25

(i)

354
11

°C
(ii)

332
11

°C
(iii)

343
11

°C
(iv)

334
11

°C
(v)

333
11

°C

Question 24

24.

Weights of 12 students (in kg) are given below. Find the mean weight.

44

53

44

44

56

60

58

47

57

45

46

45

(i)

601
12

kg
(ii)

50

kg
(iii)

611
12

kg
(iv)

599
12

kg
(v)

623
12

kg

Question 25

25.

Daily wages of 15 labourers (in ₹) are given below. Find the mean wage.

426

489

343

487

412

450

485

447

472

368

445

395

436

336

341

(i)

₹

422.27
(ii)

₹

422.20
(iii)

₹

424.13
(iv)

₹

422.13
(v)

₹

423.13

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
17

9

46

31

43

40

39
is

(i)

32.14
(ii)

30.14
(iii)

31.14
(iv)

33.14
(v)

34.14

Question 28

28.

If the mean of
5
samples is
19

3
5
,

what is the new mean if
10
is added to each number.

(i)

206
7
(ii)

146
5
(iii)

148
5
(iv)

30

Question 29

29.

If the mean of
6
samples is
22

1
3
,

what is the new mean if
7
is subtracted from each number.

(i)

44
3
(ii)

76
5
(iii)

16
(iv)

46
3

Question 30

30.

If the mean of
5
samples is
21

1
5
,

what is the new mean if each number is multiplied by
8
.

(i)

846
5
(ii)

170
(iii)

848
5
(iv)

1186
7

Question 31

31.

(i)

11
(ii)

14
(iii)

15
(iv)

13
(v)

17

Question 32

32.

(i)

12
(ii)

13
(iii)

17
(iv)

14
(v)

15

Question 33

33.

The mean of the below random sample is
26

4
5
.
Find the missing quantity.
32

24

31

15

x

32

31

25

36

16

(i)

28
(ii)

25
(iii)

27
(iv)

26
(v)

24

Assignment Key