EduSahara™ Worksheet

EduSahara™ Assignment

Name : Mean of Frequency Distribution

Chapter : Statistics

Grade : ICSE Grade VII

License : Non Commercial Use

Question 1

1.

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

Height (in cm)

146

157

160

173

174

175

No. of students

2

1

3

1

1

2

(i)

813
5

cm
(ii)

163

cm
(iii)

818
5

cm
(iv)

823
5

cm
(v)

814
5

cm

Question 2

2.

Heights of 25 plants are given below. Find the mean.

Height (in cm)

62

63

64

68

81

97

98

No. of plants

6

1

6

2

5

3

2

(i)

1847
25

cm
(ii)

1848
25

cm
(iii)

1849
25

cm
(iv)

1897
25

cm
(v)

1872
25

cm

Question 3

3.

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

Age (in years)

10

11

12

13

14

15

No. of students

4

3

3

2

2

6

(i)

127
10

years
(ii)

51
4

years
(iii)

253
20

years
(iv)

293
20

years
(v)

273
20

years

Question 4

4.

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

Score

71

72

80

81

83

85

86

88

No. of students

1

4

2

3

2

4

1

3

(i)

819
10
(ii)

829
10
(iii)

809
10
(iv)

81
(v)

811
10

Question 5

5.

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

Rainfall (in mm)

5

6

7

8

10

11

12

13

14

15

No. of days

1

2

1

3

1

1

1

2

4

4

(i)

243
20

mm
(ii)

45
4

mm
(iii)

223
20

mm
(iv)

263
20

mm
(v)

56
5

mm

Question 6

6.

Temperatures of 15 days are given below. Find the mean.

Temperature (in degree C)

25

26

28

29

31

34

35

No. of days

1

2

3

1

4

1

3

(i)

153
5

°C
(ii)

152
5

°C
(iii)

156
5

°C
(iv)

161
5

°C
(v)

151
5

°C

Question 7

7.

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

Weight (in kg)

40

44

46

48

56

57

58

59

No. of students

3

3

1

2

6

1

2

2

(i)

1021
20

kg
(ii)

1061
20

kg
(iii)

1041
20

kg
(iv)

511
10

kg
(v)

1023
20

kg

Question 8

8.

Wages of 15 labourers are given below. Find the mean.

Wage (in rupees)

328

338

371

389

436

459

No. of labourers

5

2

2

2

2

2

(i)

₹

376.07
(ii)

₹

377.07
(iii)

₹

375.13
(iv)

₹

375.07
(v)

₹

375.20

Question 9

9.

If the sum of the following frequency distribution is
24
,

find the value of 'x'.

Value

Frequency

2

3

3

x

4

2

5

1

6

2

8

3

10

2

11

2

12

1

13

4

14

1

(i)

3
(ii)

2
(iii)

4
(iv)

0
(v)

6

Question 10

10.

If the mean of the following frequency distribution is
6

11
21
,

find the value of 'x'.

Value

Frequency

4

4

5

5

6

2

7

x

9

4

10

2

(i)

1
(ii)

3
(iii)

6
(iv)

5
(v)

4

Assignment Key