EduSahara™ Worksheet

EduSahara™ Assignment

Name : Mean of Frequency Distribution

Chapter : Statistics

Grade : ICSE Grade VII

License : Non Commercial Use

Question 1

1.

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

Height (in cm)

125

131

143

144

145

162

166

168

No. of students

1

3

1

3

3

4

3

2

(i)

301
2

cm
(ii)

305
2

cm
(iii)

151

cm
(iv)

303
2

cm

Question 2

2.

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

Height (in cm)

60

70

79

80

81

99

No. of plants

3

1

1

3

1

1

(i)

749
10

cm
(ii)

759
10

cm
(iii)

751
10

cm
(iv)

75

cm
(v)

769
10

cm

Question 3

3.

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

Age (in years)

10

11

13

14

15

No. of students

6

8

6

3

2

(i)

298
25

years
(ii)

323
25

years
(iii)

12

years
(iv)

348
25

years
(v)

299
25

years

Question 4

4.

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

Score

70

73

79

80

84

85

88

89

No. of students

1

1

1

2

1

1

2

1

(i)

82
(ii)

409
5
(iii)

413
5
(iv)

408
5
(v)

418
5

Question 5

5.

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

Rainfall (in mm)

5

8

9

11

13

14

No. of days

1

1

2

1

3

2

(i)

11

mm
(ii)

129
10

mm
(iii)

111
10

mm
(iv)

109
10

mm
(v)

119
10

mm

Question 6

6.

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

Temperature (in degree C)

27

28

29

32

33

34

35

No. of days

2

1

1

1

2

1

2

(i)

333
10

°C
(ii)

323
10

°C
(iii)

157
5

°C
(iv)

63
2

°C
(v)

313
10

°C

Question 7

7.

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

Weight (in kg)

50

51

52

55

56

57

59

No. of students

4

1

4

3

2

4

2

(i)

271
5

kg
(ii)

543
10

kg
(iii)

541
10

kg
(iv)

561
10

kg
(v)

551
10

kg

Question 8

8.

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

Wage (in rupees)

325

338

349

376

401

430

No. of labourers

1

2

1

2

2

2

(i)

₹

377.40
(ii)

₹

376.60
(iii)

₹

378.40
(iv)

₹

376.80
(v)

₹

376.40

Question 9

9.

If the sum of the following frequency distribution is
22
,

find the value of 'x'.

Value

Frequency

4

2

5

2

6

2

7

3

8

x

9

1

10

3

12

3

13

2

(i)

1
(ii)

3
(iii)

5
(iv)

6
(v)

4

Question 10

10.

If the mean of the following frequency distribution is
8

2
15
,

find the value of 'x'.

Value

Frequency

4

3

5

x

6

5

7

6

8

1

9

5

10

2

11

2

12

5

(i)

1
(ii)

0
(iii)

-2
(iv)

3
(v)

2

Assignment Key