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)

136

137

156

158

159

160

173

No. of students

1

1

1

1

2

2

2

(i)

1581
10

cm
(ii)

1571
10

cm
(iii)

1573
10

cm
(iv)

1591
10

cm
(v)

786
5

cm

Question 2

2.

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

Height (in cm)

52

54

57

63

80

87

91

96

No. of plants

2

2

4

3

5

4

3

2

(i)

1843
25

cm
(ii)

1892
25

cm
(iii)

1867
25

cm
(iv)

1844
25

cm
(v)

1842
25

cm

Question 3

3.

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

Age (in years)

10

11

12

13

14

15

No. of students

6

8

4

3

4

5

(i)

71
5

years
(ii)

62
5

years
(iii)

66
5

years
(iv)

61
5

years
(v)

63
5

years

Question 4

4.

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

Score

70

75

76

78

83

88

89

No. of students

1

1

3

1

1

2

1

(i)

799
10
(ii)

819
10
(iii)

801
10
(iv)

80
(v)

809
10

Question 5

5.

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

Rainfall (in mm)

5

6

7

8

9

10

12

13

No. of days

1

2

2

4

2

1

3

5

(i)

53
5

mm
(ii)

48
5

mm
(iii)

58
5

mm
(iv)

10

mm
(v)

49
5

mm

Question 6

6.

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

Temperature (in degree C)

26

30

31

32

35

No. of days

1

2

2

1

4

(i)

33

°C
(ii)

31

°C
(iii)

34

°C
(iv)

32

°C
(v)

30

°C

Question 7

7.

Weights of 15 students are given below. Find the mean.

Weight (in kg)

40

42

47

57

58

59

60

No. of students

4

1

2

1

2

2

3

(i)

769
15

kg
(ii)

767
15

kg
(iii)

782
15

kg
(iv)

797
15

kg
(v)

256
5

kg

Question 8

8.

Wages of 10 labourers are given below. Find the mean.

Wage (in rupees)

380

425

452

465

481

493

No. of labourers

1

2

2

1

2

2

(i)

₹

456.70
(ii)

₹

454.90
(iii)

₹

455.70
(iv)

₹

454.80
(v)

₹

454.70

Question 9

9.

If the sum of the following frequency distribution is
39
,

find the value of 'x'.

Value

Frequency

2

1

3

5

4

5

5

2

6

6

7

2

8

x

9

2

11

2

12

4

13

3

14

1

15

4

(i)

3
(ii)

0
(iii)

2
(iv)

1
(v)

4

Question 10

10.

If the mean of the following frequency distribution is
9

2
29
,

find the value of 'x'.

Value

Frequency

4

3

5

3

7

4

8

2

9

3

10

1

11

x

12

2

13

2

14

2

(i)

4
(ii)

9
(iii)

6
(iv)

7
(v)

8

Assignment Key