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 10 students are given below. Find the mean.
Height (in cm)
139
151
158
172
No. of students
3
3
2
2
(i)
155
cm
(ii)
153
cm
(iii)
151
cm
(iv)
152
cm
(v)
154
cm
Question
2
2.
Heights of 30 plants are given below. Find the mean.
Height (in cm)
50
53
62
64
77
78
79
No. of plants
4
5
9
2
2
3
5
(i)
323
5
cm
(ii)
982
15
cm
(iii)
997
15
cm
(iv)
967
15
cm
(v)
968
15
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
3
6
2
3
3
3
(i)
143
10
years
(ii)
133
10
years
(iii)
123
10
years
(iv)
62
5
years
(v)
25
2
years
Question
4
4.
Scores of 10 students are given below. Find the mean.
Score
72
76
80
84
87
89
90
No. of students
1
1
2
1
1
2
2
(i)
837
10
(ii)
419
5
(iii)
847
10
(iv)
839
10
(v)
857
10
Question
5
5.
Rainfall of 10 days are given below. Find the mean.
Rainfall (in mm)
6
11
12
14
15
No. of days
2
2
2
2
2
(i)
58
5
mm
(ii)
68
5
mm
(iii)
59
5
mm
(iv)
63
5
mm
(v)
12
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
32
34
35
No. of days
3
1
2
1
1
2
3
2
4
1
(i)
32
°C
(ii)
30
°C
(iii)
29
°C
(iv)
28
°C
(v)
31
°C
Question
7
7.
Weights of 30 students are given below. Find the mean.
Weight (in kg)
46
48
49
50
52
55
56
59
60
No. of students
4
2
3
3
2
4
6
3
3
(i)
827
15
kg
(ii)
266
5
kg
(iii)
812
15
kg
(iv)
799
15
kg
(v)
797
15
kg
Question
8
8.
Wages of 10 labourers are given below. Find the mean.
Wage (in rupees)
308
312
371
452
470
479
No. of labourers
1
1
2
2
1
3
(i)
₹
419.30
(ii)
₹
418.30
(iii)
₹
417.30
(iv)
₹
417.50
(v)
₹
417.40
Question
9
9.
If the mean of the following frequency distribution is
7
1
6
,
find the value of 'x'.
Value
Frequency
3
6
4
4
5
6
6
3
7
2
8
1
9
x
11
5
12
6
(i)
3
(ii)
2
(iii)
1
(iv)
5
(v)
4
Assignment Key
1) (ii)
2) (iv)
3) (iii)
4) (i)
5) (i)
6) (ii)
7) (v)
8) (iii)
9) (i)
