EduSahara™ Worksheet

Question 1

1.

(i)

5
(ii)

7
(iii)

3
(iv)

9
(v)

6

Question 2

2.

Weights of 20 students are given below. Find the mean.

Weight (in kg)

41

46

47

49

50

52

57

58

No. of students

3

3

1

2

3

4

3

1

(i)

199
4

kg
(ii)

1013
20

kg
(iii)

497
10

kg
(iv)

993
20

kg
(v)

1033
20

kg

Question 3

3.

Find the mean of first 10 multiples of 3.

(i)

17
(ii)

35
2
(iii)

31
2
(iv)

65
4
(v)

33
2

Question 4

4.

Weights of 147 students (in kg) are given below. Calculate the mean weight from the given histogram.

(i)

63.47 kg
(ii)

65.47 kg
(iii)

55.47 kg
(iv)

60.47 kg
(v)

57.47 kg

Question 5

5.

Find the mean of first 8 whole numbers.

(i)

7
2
(ii)

9
2
(iii)

5
2
(iv)

13
4
(v)

4

Question 6

6.

Heights of 137 students (in cm) are given below. Calculate the mean height from the given histogram.

(i)

161.34 cm
(ii)

113.34 cm
(iii)

152.34 cm
(iv)

124.34 cm
(v)

136.34 cm

Question 7

7.

The following frequency distribution table gives
the monthly consumption of electricity of
112
consumers in a locality.
Find the
mean units.

Monthly consumption (in units)

79 - 99

99 - 119

119 - 139

139 - 159

159 - 179

179 - 199

No. of consumers

24

21

23

12

21

11

(i)

1853
14

units
(ii)

1865
14

units
(iii)

1879
14

units
(iv)

926
7

units
(v)

1851
14

units

Question 8

8.

The histogram given below shows the number of illiterate persons of different age groups in a town. Using the data in the diagram, calculate the mean age

(i)

64.09 years
(ii)

65.09 years
(iii)

63.09 years
(iv)

62.09 years
(v)

61.09 years

Question 9

9.

Heights of 15 students (in cm) are given below. Find the mean height.

166

150

128

173

135

150

140

126

142

148

143

151

132

159

141

(i)

729
5

cm
(ii)

738
5

cm
(iii)

733
5

cm
(iv)

728
5

cm
(v)

146

cm

Question 10

10.

The marks obtained by 43 students of a class in an examination is given below. Calculate the mean mark correct to 2 decimal places.

Marks

less than 20

less than 25

less than 30

less than 35

less than 40

less than 45

No. of students

5

14

21

29

38

43

(i)

33.06
(ii)

25.06
(iii)

30.06
(iv)

35.06
(v)

27.06

Question 11

11.

The histogram given below represents the marks obtained by some candidates in an examination. Using the data in the diagram, calculate the mean marks

(i)

54
(ii)

56
(iii)

52
(iv)

53
(v)

55

Question 12

12.

The histogram given below represents the marks obtained by some candidates in an examination.

Using data in the diagram, calculate the
mean
marks.

(i)

47.98
(ii)

45.98
(iii)

46.98
(iv)

49.98
(v)

48.98

Question 13

13.

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

41

48

40

54

51

43

42

60

55

52

51

45

53

(i)

661
13

kg
(ii)

635
13

kg
(iii)

636
13

kg
(iv)

49

kg
(v)

648
13

kg

Question 14

14.

Daily wages of 250 labourers (in ₹) are given below. Calculate the mean wage from the given histogram.

(i)

₹253.92
(ii)

₹264.92
(iii)

₹212.92
(iv)

₹228.92
(v)

₹240.92

Question 15

15.

The marks obtained by 13 students in a test are given below. Find the mean of their marks when the marks of each student is increased by 3.

41

29

29

46

28

38

37

17

48

37

25

22

4

(i)

438
13
(ii)

506
15
(iii)

440
13
(iv)

34

Question 16

16.

Rainfall of 30 days are given below. Find the mean.

Rainfall (in mm)

5

6

7

8

9

10

11

12

13

14

15

No. of days

1

3

3

2

3

2

5

2

1

3

5

(i)

32
3

mm
(ii)

158
15

mm
(iii)

173
15

mm
(iv)

53
5

mm
(v)

188
15

mm

Question 17

17.

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

496

396

358

474

431

424

453

328

481

487

487

452

371

469

457

(i)

₹

437.80
(ii)

₹

439.60
(iii)

₹

438.60
(iv)

₹

437.60
(v)

₹

438.00

Question 18

18.

Ages of 143 students (in years) are given below. Calculate the mean age from the given histogram.

(i)

32.85 years
(ii)

35.85 years
(iii)

37.85 years
(iv)

29.85 years
(v)

27.85 years

Question 19

19.

Scores of 11 students are given below. Find the mean score.

83

70

81

77

85

71

90

70

90

71

72

(i)

861
11
(ii)

882
11
(iii)

860
11
(iv)

862
11
(v)

871
11

Question 20

20.

If the mean of
6
samples is
29

1
2
,

what is the new mean if each number is multiplied by
9
.

(i)

1061
4
(ii)

529
2
(iii)

531
2
(iv)

533
2
(v)

266

Question 21

21.

Rainfall of 15 days (in mm) are given below. Find the mean rainfall.

6

5

10

6

6

5

13

13

14

5

5

12

9

9

9

(i)

157
15

mm
(ii)

142
15

mm
(iii)

127
15

mm
(iv)

43
5

mm
(v)

128
15

mm

Question 22

22.

Scores of 30 students are given below. Find the mean.

Score

71

73

75

78

81

84

89

90

No. of students

2

5

1

5

3

8

4

2

(i)

2453
30
(ii)

404
5
(iii)

2483
30
(iv)

485
6
(v)

2423
30

Question 23

23.

Scores of 177 students are given below. Calculate the mean score from the given histogram.

(i)

94.66
(ii)

89.66
(iii)

99.66
(iv)

97.66
(v)

91.66

Question 24

24.

(i)

11
(ii)

10
(iii)

9
(iv)

8
(v)

12

Question 25

25.

(i)

8
(ii)

7
(iii)

6
(iv)

10
(v)

5

Assignment Key