EduSahara™ Worksheet

EduSahara™ Assignment

Name : Mean of Frequency Distribution

Chapter : Statistics

Grade : ICSE Grade VII

License : Non Commercial Use

Question 1

1.

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

Height (in cm)

143

144

147

162

164

167

169

No. of students

4

1

3

2

2

1

2

(i)

772
5

cm
(ii)

463
3

cm
(iii)

2344
15

cm
(iv)

2314
15

cm
(v)

2329
15

cm

Question 2

2.

Heights of 20 plants are given below. Find the mean.

Height (in cm)

55

60

63

76

84

95

97

No. of plants

2

2

1

2

7

3

3

(i)

1649
20

cm
(ii)

1609
20

cm
(iii)

1629
20

cm
(iv)

161
2

cm
(v)

1611
20

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

5

3

1

8

5

8

(i)

391
30

years
(ii)

449
30

years
(iii)

13

years
(iv)

389
30

years
(v)

419
30

years

Question 4

4.

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

Score

72

74

75

79

80

85

86

87

88

No. of students

1

1

1

1

1

2

1

1

1

(i)

811
10
(ii)

821
10
(iii)

831
10
(iv)

813
10
(v)

406
5

Question 5

5.

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

Rainfall (in mm)

6

8

10

12

13

14

No. of days

2

1

2

1

1

3

(i)

107
10

mm
(ii)

127
10

mm
(iii)

54
5

mm
(iv)

109
10

mm
(v)

117
10

mm

Question 6

6.

Temperatures of 25 days are given below. Find the mean.

Temperature (in degree C)

25

26

27

28

29

31

32

34

35

No. of days

4

2

1

3

5

2

2

5

1

(i)

789
25

°C
(ii)

739
25

°C
(iii)

741
25

°C
(iv)

148
5

°C
(v)

764
25

°C

Question 7

7.

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

Weight (in kg)

40

42

43

47

53

56

57

58

No. of students

1

2

1

1

2

2

3

3

(i)

261
5

kg
(ii)

269
5

kg
(iii)

264
5

kg
(iv)

52

kg
(v)

259
5

kg

Question 8

8.

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

Wage (in rupees)

303

314

352

355

397

444

445

459

470

No. of labourers

3

3

2

3

3

6

3

1

1

(i)

₹

389.60
(ii)

₹

389.64
(iii)

₹

389.56
(iv)

₹

391.56
(v)

₹

390.56

Question 9

9.

If the sum of the following frequency distribution is
37
,

find the value of 'x'.

Value

Frequency

3

6

4

1

5

8

6

1

7

4

8

5

9

2

10

4

11

x

(i)

5
(ii)

7
(iii)

9
(iv)

6
(v)

4

Question 10

10.

If the mean of the following frequency distribution is
6

7
22
,

find the value of 'x'.

Value

Frequency

3

5

4

1

5

x

6

4

7

1

8

3

9

1

10

1

12

1

14

1

(i)

3
(ii)

5
(iii)

4
(iv)

6
(v)

1

Assignment Key