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 10 students are given below. Find the mean.
Height (in cm)
130
146
150
162
169
No. of students
1
1
3
3
2
(i)
153
cm
(ii)
156
cm
(iii)
154
cm
(iv)
157
cm
(v)
155
cm
Question
2
2.
Heights of 20 plants are given below. Find the mean.
Height (in cm)
50
51
64
67
80
81
82
84
92
93
100
No. of plants
2
2
1
1
2
1
2
3
3
1
2
(i)
78
cm
(ii)
1561
20
cm
(iii)
1579
20
cm
(iv)
1599
20
cm
(v)
1559
20
cm
Question
3
3.
Ages of 25 students are given below. Find the mean.
Age (in years)
10
11
12
13
14
No. of students
4
8
5
5
3
(i)
69
5
years
(ii)
61
5
years
(iii)
59
5
years
(iv)
12
years
(v)
64
5
years
Question
4
4.
Scores of 15 students are given below. Find the mean.
Score
73
74
76
78
79
84
85
88
No. of students
1
2
2
1
2
3
3
1
(i)
402
5
(ii)
1204
15
(iii)
1219
15
(iv)
1234
15
(v)
241
3
Question
5
5.
Rainfall of 15 days are given below. Find the mean.
Rainfall (in mm)
5
6
7
10
11
13
14
15
No. of days
2
3
1
2
2
3
1
1
(i)
35
3
mm
(ii)
10
mm
(iii)
32
3
mm
(iv)
29
3
mm
(v)
31
3
mm
Question
6
6.
Temperatures of 30 days are given below. Find the mean.
Temperature (in degree C)
25
26
27
28
29
30
31
32
33
34
35
No. of days
1
4
1
2
2
2
2
4
5
4
3
(i)
478
15
°C
(ii)
464
15
°C
(iii)
31
°C
(iv)
463
15
°C
(v)
493
15
°C
Question
7
7.
Weights of 25 students are given below. Find the mean.
Weight (in kg)
40
50
54
56
57
No. of students
3
6
4
7
5
(i)
1363
25
kg
(ii)
1314
25
kg
(iii)
1313
25
kg
(iv)
1338
25
kg
(v)
263
5
kg
Question
8
8.
Wages of 25 labourers are given below. Find the mean.
Wage (in rupees)
327
381
385
414
442
457
482
No. of labourers
4
9
2
3
5
1
1
(i)
₹
397.92
(ii)
₹
395.92
(iii)
₹
396.92
(iv)
₹
396.00
(v)
₹
395.96
Question
9
9.
The following table shows the weights of
98
persons in a group.
Find the
mean weight.
Weight (in kg)
40 - 45
46 - 51
52 - 57
58 - 63
64 - 69
70 - 75
76 - 81
82 - 87
No. of persons
10
16
17
18
5
10
14
8
(i)
6049
98
kg
(ii)
3025
49
kg
(iii)
6147
98
kg
(iv)
6245
98
kg
(v)
6051
98
kg
Question
10
10.
The following table shows the weights of
73
persons in a group.
Find the
mean weight.
Weight (in kg)
10 - 15
15 - 20
20 - 25
25 - 30
30 - 35
35 - 40
No. of persons
14
5
9
15
13
17
(i)
3875
146
kg
(ii)
4167
146
kg
(iii)
3877
146
kg
(iv)
1938
73
kg
(v)
4021
146
kg
Question
11
11.
The daily wages of
166
workers in a factory are given below.
Find the
mean wage.
Wage (in rupees)
30 - 39
40 - 49
50 - 59
60 - 69
70 - 79
80 - 89
90 - 99
100 - 109
No. of workers
8
25
22
7
29
27
28
20
(i)
₹
73.61
(ii)
₹
75.60
(iii)
₹
74.60
(iv)
₹
73.60
Question
12
12.
The daily wages of
83
workers in a factory are given below.
Find the
mean wage.
Wage (in rupees)
20 - 27
27 - 34
34 - 41
41 - 48
48 - 55
55 - 62
No. of workers
12
5
15
9
30
12
(i)
₹
43.92
(ii)
₹
45.91
(iii)
₹
43.91
(iv)
₹
44.91
Question
13
13.
A frequency distribution table is given below.
Find the
mean .
Class-Interval
5 - 13
14 - 22
23 - 31
32 - 40
41 - 49
Frequency
25
43
24
49
45
(i)
906
31
(ii)
968
31
(iii)
907
31
(iv)
937
31
(v)
908
31
Question
14
14.
A frequency distribution table is given below.
Find the
mean .
Class-Interval
1 - 7
7 - 13
13 - 19
19 - 25
25 - 31
31 - 37
37 - 43
Frequency
17
11
10
30
29
34
15
(i)
1784
73
(ii)
1856
73
(iii)
1929
73
(iv)
1785
73
(v)
1783
73
Question
15
15.
The following frequency distribution table gives
the monthly consumption of electricity of
96
consumers in a locality.
Find the
mean units.
Monthly consumption (in units)
74 - 94
94 - 114
114 - 134
134 - 154
154 - 174
174 - 194
194 - 214
No. of consumers
14
15
8
11
10
18
20
(i)
1817
12
units
(ii)
299
2
units
(iii)
1805
12
units
(iv)
1793
12
units
(v)
1795
12
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)
54.32
(ii)
58.32
(iii)
56.32
(iv)
57.32
(v)
55.32
Assignment Key
1) (v)
2) (v)
3) (iii)
4) (ii)
5) (iv)
6) (iv)
7) (iii)
8) (ii)
9) (i)
10) (i)
11) (iv)
12) (iii)
13) (i)
14) (v)
15) (iv)
16) (iii)
