EduSahara™ Worksheet

EduSahara™ Assignment

Name : Mean of Frequency Distribution

Chapter : Mean and Median of Ungrouped Data

Grade : ICSE Grade IX

License : Non Commercial Use

Question 1

1.

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

Height (in cm)

127

133

143

146

154

170

171

172

No. of students

2

4

5

5

1

3

4

6

(i)

1537
10

cm
(ii)

1547
10

cm
(iii)

1557
10

cm
(iv)

769
5

cm
(v)

1539
10

cm

Question 2

2.

Heights of 15 plants are given below. Find the mean.

Height (in cm)

52

62

63

72

84

85

95

No. of plants

4

3

2

1

2

2

1

(i)

69

cm
(ii)

206
3

cm
(iii)

211
3

cm
(iv)

205
3

cm
(v)

208
3

cm

Question 3

3.

Ages of 10 students are given below. Find the mean.

Age (in years)

10

11

12

13

15

No. of students

1

2

1

1

5

(i)

66
5

years
(ii)

67
5

years
(iii)

68
5

years
(iv)

71
5

years
(v)

76
5

years

Question 4

4.

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

Score

72

73

77

79

81

84

85

86

88

89

90

No. of students

3

1

5

2

5

3

2

3

1

3

2

(i)

1226
15
(ii)

1256
15
(iii)

1241
15
(iv)

1228
15
(v)

409
5

Question 5

5.

Rainfall of 10 days are given below. Find the mean.

Rainfall (in mm)

5

6

8

12

13

15

No. of days

1

2

1

2

2

2

(i)

11

mm
(ii)

23
2

mm
(iii)

21
2

mm
(iv)

25
2

mm

Question 6

6.

Temperatures of 20 days are given below. Find the mean.

Temperature (in degree C)

26

27

29

30

31

32

35

No. of days

4

1

3

4

2

1

5

(i)

609
20

°C
(ii)

647
20

°C
(iii)

607
20

°C
(iv)

152
5

°C
(v)

627
20

°C

Question 7

7.

Weights of 10 students are given below. Find the mean.

Weight (in kg)

40

42

46

50

52

55

No. of students

2

3

2

1

1

1

(i)

95
2

kg
(ii)

93
2

kg
(iii)

46

kg
(iv)

91
2

kg

Question 8

8.

Wages of 25 labourers are given below. Find the mean.

Wage (in rupees)

344

360

365

396

431

437

444

448

457

469

No. of labourers

4

4

1

1

3

3

1

2

2

4

(i)

₹

412.48
(ii)

₹

412.52
(iii)

₹

414.44
(iv)

₹

413.44
(v)

₹

412.44

Question 9

9.

If the mean of the following frequency distribution is
9

12
31
,

find the value of 'x'.

Value

Frequency

5

4

6

5

7

2

8

x

9

2

10

2

11

5

12

1

13

2

14

3

15

2

(i)

2
(ii)

6
(iii)

4
(iv)

1
(v)

3

Assignment Key