EduSahara™ Worksheet

EduSahara™ Assignment

Name : Mean of Frequency Distribution

Chapter : Statistics

Grade : ICSE Grade VIII

License : Non Commercial Use

Question 1

1.

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

Height (in cm)

128

130

134

144

145

147

150

153

161

No. of students

1

3

2

3

2

3

2

4

5

(i)

3691
25

cm
(ii)

3667
25

cm
(iii)

3668
25

cm
(iv)

3666
25

cm
(v)

3716
25

cm

Question 2

2.

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

Height (in cm)

59

71

72

78

80

81

82

85

90

No. of plants

1

1

2

2

1

1

3

2

2

(i)

1189
15

cm
(ii)

1187
15

cm
(iii)

1217
15

cm
(iv)

1202
15

cm
(v)

396
5

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

2

4

4

4

4

2

(i)

27
2

years
(ii)

29
2

years
(iii)

25
2

years
(iv)

13

years

Question 4

4.

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

Score

70

78

80

84

90

No. of students

3

2

2

1

2

(i)

78
(ii)

77
(iii)

81
(iv)

79
(v)

80

Question 5

5.

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

Rainfall (in mm)

5

7

9

10

11

14

15

No. of days

3

4

2

2

3

3

8

(i)

276
25

mm
(ii)

278
25

mm
(iii)

326
25

mm
(iv)

277
25

mm
(v)

301
25

mm

Question 6

6.

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

Temperature (in degree C)

25

26

27

28

29

30

31

34

35

No. of days

4

3

3

3

1

1

1

1

3

(i)

29

°C
(ii)

144
5

°C
(iii)

143
5

°C
(iv)

148
5

°C
(v)

153
5

°C

Question 7

7.

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

Weight (in kg)

41

46

47

48

53

54

58

59

No. of students

3

5

6

3

4

4

4

1

(i)

764
15

kg
(ii)

50

kg
(iii)

779
15

kg
(iv)

751
15

kg
(v)

749
15

kg

Question 8

8.

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

Wage (in rupees)

385

389

409

413

427

No. of labourers

2

1

3

1

3

(i)

₹

409.00
(ii)

₹

406.00
(iii)

₹

410.00
(iv)

₹

407.00
(v)

₹

408.00

Question 9

9.

If the mean of the following frequency distribution is
6

1
5
,

find the value of 'x'.

Value

Frequency

4

8

5

x

6

8

7

3

8

3

9

3

10

3

(i)

6
(ii)

9
(iii)

4
(iv)

7
(v)

8

Question 10

10.

If the sum of the following frequency distribution is
36
,

find the value of 'x'.

Value

Frequency

4

7

5

4

6

7

7

5

8

6

9

2

10

x

11

1

(i)

5
(ii)

7
(iii)

2
(iv)

4
(v)

3

Assignment Key