EduSahara™ Assignment
Name : Mean of Grouped Data
Chapter : Measures of Central Tendency
Grade : ICSE Grade X
License : Non Commercial Use
Question
1
1.
Heights of 25 students are given below. Find the mean.
Height (in cm)
136
139
146
151
153
156
159
161
164
165
171
No. of students
1
1
1
3
2
3
5
3
2
2
2
(i)
3927
25
cm
(ii)
3976
25
cm
(iii)
3926
25
cm
(iv)
3928
25
cm
(v)
3951
25
cm
Question
2
2.
Heights of 25 plants are given below. Find the mean.
Height (in cm)
51
52
58
65
82
94
No. of plants
7
5
4
3
3
3
(i)
1572
25
cm
(ii)
1597
25
cm
(iii)
1574
25
cm
(iv)
1573
25
cm
(v)
1622
25
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
5
1
3
4
5
2
(i)
289
20
years
(ii)
269
20
years
(iii)
251
20
years
(iv)
25
2
years
(v)
249
20
years
Question
4
4.
Scores of 20 students are given below. Find the mean.
Score
72
78
79
84
87
89
90
No. of students
1
1
4
3
3
6
2
(i)
1713
20
(ii)
339
4
(iii)
1693
20
(iv)
1733
20
(v)
847
10
Question
5
5.
Rainfall of 20 days are given below. Find the mean.
Rainfall (in mm)
5
7
8
10
11
12
13
14
No. of days
4
2
5
2
2
2
1
2
(i)
201
20
mm
(ii)
91
10
mm
(iii)
221
20
mm
(iv)
183
20
mm
(v)
181
20
mm
Question
6
6.
Temperatures of 30 days are given below. Find the mean.
Temperature (in degree C)
25
26
28
30
31
32
35
No. of days
4
4
4
6
4
3
5
(i)
317
10
°C
(ii)
149
5
°C
(iii)
299
10
°C
(iv)
297
10
°C
(v)
307
10
°C
Question
7
7.
Weights of 30 students are given below. Find the mean.
Weight (in kg)
40
43
45
51
52
57
59
60
No. of students
5
5
4
4
4
5
2
1
(i)
49
kg
(ii)
50
kg
(iii)
47
kg
(iv)
51
kg
(v)
48
kg
Question
8
8.
Wages of 15 labourers are given below. Find the mean.
Wage (in rupees)
308
313
321
352
372
419
429
No. of labourers
2
3
1
1
1
1
6
(i)
₹
373.00
(ii)
₹
372.93
(iii)
₹
373.87
(iv)
₹
374.87
(v)
₹
372.87
Question
9
9.
The following table shows the weights of
89
persons in a group.
Find the
mean weight.
Weight (in kg)
10 - 17
18 - 25
26 - 33
34 - 41
42 - 49
50 - 57
58 - 65
66 - 73
No. of persons
14
17
11
12
7
11
10
7
(i)
77
2
kg
(ii)
38
kg
(iii)
75
2
kg
(iv)
79
2
kg
Question
10
10.
The following table shows the weights of
45
persons in a group.
Find the
mean weight.
Weight (in kg)
40 - 49
49 - 58
58 - 67
67 - 76
76 - 85
No. of persons
6
9
8
13
9
(i)
129
2
kg
(ii)
133
2
kg
(iii)
65
kg
(iv)
131
2
kg
Question
11
11.
The daily wages of
117
workers in a factory are given below.
Find the
mean wage.
Wage (in rupees)
30 - 36
37 - 43
44 - 50
51 - 57
58 - 64
65 - 71
No. of workers
25
30
19
14
21
8
(i)
₹
49.00
(ii)
₹
47.00
(iii)
₹
46.00
(iv)
₹
45.00
(v)
₹
48.00
Question
12
12.
The daily wages of
114
workers in a factory are given below.
Find the
mean wage.
Wage (in rupees)
30 - 38
38 - 46
46 - 54
54 - 62
62 - 70
No. of workers
22
29
25
27
11
(i)
₹
49.32
(ii)
₹
48.37
(iii)
₹
48.32
(iv)
₹
50.32
(v)
₹
48.42
Question
13
13.
A frequency distribution table is given below.
Find the
mean .
Class-Interval
19 - 25
26 - 32
33 - 39
40 - 46
47 - 53
54 - 60
61 - 67
Frequency
24
24
7
34
43
7
19
(i)
7019
158
(ii)
6705
158
(iii)
3352
79
(iv)
6861
158
(v)
6703
158
Question
14
14.
A frequency distribution table is given below.
Find the
mean .
Class-Interval
16 - 25
25 - 34
34 - 43
43 - 52
52 - 61
61 - 70
Frequency
10
31
39
35
23
18
(i)
564
13
(ii)
1127
26
(iii)
1129
26
(iv)
1153
26
(v)
1179
26
Question
15
15.
The following frequency distribution table gives
the monthly consumption of electricity of
116
consumers in a locality.
Find the
mean units.
Monthly consumption (in units)
64 - 74
74 - 84
84 - 94
94 - 104
104 - 114
114 - 124
No. of consumers
20
20
19
8
24
25
(i)
5519
58
units
(ii)
5633
58
units
(iii)
5517
58
units
(iv)
5575
58
units
(v)
2759
29
units
Question
16
16.
The histogram given below represents the marks obtained by some candidates in an examination.
Using data in the diagram, calculate the
mean
marks.
(i)
55.9
(ii)
51.9
(iii)
53.9
(iv)
52.9
(v)
54.9
Assignment Key
1) (iii)
2) (i)
3) (v)
4) (iii)
5) (v)
6) (iv)
7) (i)
8) (v)
9) (iii)
10) (i)
11) (ii)
12) (iii)
13) (v)
14) (ii)
15) (iii)
16) (iii)
