EduSahara™ Worksheet

EduSahara™ Assignment

Name : Mean of Frequency Distribution

Chapter : Mean and Median of Ungrouped Data

Grade : ICSE Grade IX

License : Non Commercial Use

Question 1

1.

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

Height (in cm)

126

151

155

158

161

166

172

173

No. of students

2

3

5

1

4

4

9

2

(i)

485
3

cm
(ii)

487
3

cm
(iii)

484
3

cm
(iv)

162

cm
(v)

490
3

cm

Question 2

2.

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

Height (in cm)

52

55

67

70

86

93

96

100

No. of plants

4

2

2

1

4

2

2

3

(i)

391
5

cm
(ii)

387
5

cm
(iii)

388
5

cm
(iv)

396
5

cm
(v)

386
5

cm

Question 3

3.

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

Age (in years)

11

12

14

15

No. of students

4

2

2

2

(i)

64
5

years
(ii)

13

years
(iii)

73
5

years
(iv)

63
5

years
(v)

68
5

years

Question 4

4.

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

Score

70

71

76

79

81

83

90

No. of students

2

1

1

1

3

1

1

(i)

392
5
(ii)

396
5
(iii)

391
5
(iv)

401
5
(v)

393
5

Question 5

5.

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

Rainfall (in mm)

5

7

8

9

10

11

12

No. of days

1

3

3

2

3

1

2

(i)

133
15

mm
(ii)

134
15

mm
(iii)

9

mm
(iv)

163
15

mm
(v)

148
15

mm

Question 6

6.

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

Temperature (in degree C)

25

27

31

33

35

No. of days

2

8

3

2

5

(i)

28

°C
(ii)

32

°C
(iii)

29

°C
(iv)

30

°C
(v)

31

°C

Question 7

7.

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

Weight (in kg)

40

42

45

46

48

51

53

55

57

58

60

No. of students

4

3

2

3

3

1

4

1

2

3

4

(i)

782
15

kg
(ii)

767
15

kg
(iii)

752
15

kg
(iv)

251
5

kg
(v)

754
15

kg

Question 8

8.

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

Wage (in rupees)

316

321

324

327

336

384

407

459

482

No. of labourers

2

3

1

3

2

4

2

2

1

(i)

₹

368.10
(ii)

₹

366.20
(iii)

₹

367.10
(iv)

₹

366.30
(v)

₹

366.10

Question 9

9.

If the mean of the following frequency distribution is
5

27
38
,

find the value of 'x'.

Value

Frequency

1

3

2

x

3

4

4

5

5

1

6

7

7

4

8

5

9

2

10

1

11

3

(i)

5
(ii)

4
(iii)

0
(iv)

2
(v)

3

Assignment Key