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 15 students are given below. Find the mean.
Height (in cm)
144
145
146
152
156
166
169
No. of students
3
1
1
1
4
2
3
(i)
156
cm
(ii)
2368
15
cm
(iii)
2353
15
cm
(iv)
2339
15
cm
(v)
2338
15
cm
Question
2
2.
Heights of 25 plants are given below. Find the mean.
Height (in cm)
56
69
72
78
82
92
97
100
No. of plants
1
4
4
1
1
5
5
4
(i)
87
cm
(ii)
84
cm
(iii)
85
cm
(iv)
86
cm
(v)
83
cm
Question
3
3.
Ages of 15 students are given below. Find the mean.
Age (in years)
10
11
12
13
15
No. of students
1
4
4
4
2
(i)
214
15
years
(ii)
184
15
years
(iii)
37
3
years
(iv)
199
15
years
(v)
62
5
years
Question
4
4.
Scores of 10 students are given below. Find the mean.
Score
70
71
78
79
85
89
No. of students
1
1
1
5
1
1
(i)
399
5
(ii)
396
5
(iii)
79
(iv)
404
5
(v)
394
5
Question
5
5.
Rainfall of 25 days are given below. Find the mean.
Rainfall (in mm)
5
6
7
9
10
11
12
13
14
15
No. of days
1
3
2
2
4
2
3
2
4
2
(i)
54
5
mm
(ii)
11
mm
(iii)
53
5
mm
(iv)
58
5
mm
(v)
63
5
mm
Question
6
6.
Temperatures of 30 days are given below. Find the mean.
Temperature (in degree C)
25
26
27
28
29
31
32
34
35
No. of days
7
7
2
2
4
3
2
2
1
(i)
301
10
°C
(ii)
281
10
°C
(iii)
291
10
°C
(iv)
283
10
°C
(v)
141
5
°C
Question
7
7.
Weights of 10 students are given below. Find the mean.
Weight (in kg)
41
44
45
46
51
55
56
60
No. of students
2
1
1
2
1
1
1
1
(i)
49
kg
(ii)
101
2
kg
(iii)
97
2
kg
(iv)
99
2
kg
Question
8
8.
Wages of 10 labourers are given below. Find the mean.
Wage (in rupees)
301
312
323
418
427
435
No. of labourers
1
1
2
2
2
2
(i)
₹
381.90
(ii)
₹
382.90
(iii)
₹
382.00
(iv)
₹
383.90
(v)
₹
382.10
Question
9
9.
If the mean of the following frequency distribution is
7
6
25
,
find the value of 'x'.
Value
Frequency
4
2
5
x
6
2
7
5
8
4
9
6
10
2
(i)
4
(ii)
7
(iii)
3
(iv)
2
(v)
5
Assignment Key
1) (v)
2) (iii)
3) (ii)
4) (v)
5) (iii)
6) (ii)
7) (iii)
8) (i)
9) (i)
