EduSahara™ Worksheet

EduSahara™ Assignment

Name : Mean of Frequency Distribution

Chapter : Statistics

Grade : ICSE Grade VIII

License : Non Commercial Use

Question 1

1.

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

Height (in cm)

126

130

137

141

145

147

150

153

160

No. of students

2

1

1

1

1

3

2

1

3

(i)

727
5

cm
(ii)

2209
15

cm
(iii)

2194
15

cm
(iv)

436
3

cm
(v)

2179
15

cm

Question 2

2.

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

Height (in cm)

55

66

71

83

84

88

No. of plants

3

2

1

1

2

1

(i)

354
5

cm
(ii)

727
10

cm
(iii)

709
10

cm
(iv)

717
10

cm
(v)

707
10

cm

Question 3

3.

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

Age (in years)

10

11

12

13

14

15

No. of students

1

3

2

2

5

2

(i)

194
15

years
(ii)

223
15

years
(iii)

193
15

years
(iv)

208
15

years
(v)

13

years

Question 4

4.

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

Score

71

73

74

78

79

80

88

No. of students

4

4

5

1

5

3

3

(i)

1924
25
(ii)

1948
25
(iii)

1973
25
(iv)

1923
25
(v)

77

Question 5

5.

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

Rainfall (in mm)

6

7

8

9

10

11

13

14

15

No. of days

2

3

2

1

1

1

1

1

3

(i)

152
15

mm
(ii)

166
15

mm
(iii)

151
15

mm
(iv)

51
5

mm
(v)

181
15

mm

Question 6

6.

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

Temperature (in degree C)

25

26

27

28

29

31

33

34

No. of days

1

8

4

6

2

1

2

1

(i)

698
25

°C
(ii)

28

°C
(iii)

748
25

°C
(iv)

723
25

°C
(v)

699
25

°C

Question 7

7.

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

Weight (in kg)

40

41

42

43

50

54

57

No. of students

3

6

3

1

3

3

1

(i)

236
5

kg
(ii)

228
5

kg
(iii)

227
5

kg
(iv)

226
5

kg
(v)

231
5

kg

Question 8

8.

Wages of 20 labourers are given below. Find the mean.

Wage (in rupees)

318

325

328

338

364

378

408

489

No. of labourers

5

3

2

2

1

2

1

4

(i)

₹

369.10
(ii)

₹

371.05
(iii)

₹

370.05
(iv)

₹

369.05
(v)

₹

369.15

Question 9

9.

If the mean of the following frequency distribution is
7

31
40
,

find the value of 'x'.

Value

Frequency

5

8

6

5

7

4

8

9

9

6

10

2

11

5

12

x

(i)

3
(ii)

2
(iii)

-1
(iv)

1
(v)

0

Question 10

10.

If the sum of the following frequency distribution is
20
,

find the value of 'x'.

Value

Frequency

1

2

4

2

5

2

7

3

8

2

9

1

10

x

12

2

13

3

(i)

3
(ii)

6
(iii)

4
(iv)

1
(v)

2

Assignment Key