EduSahara™ Assignment
Name : Mean of Frequency Distribution
Chapter : Statistics
Grade : SSC Grade IX
License : Non Commercial Use
Question
1
1.
Heights of 30 students are given below. Find the mean.
Height (in cm)
127
137
139
143
144
146
147
156
158
159
169
No. of students
4
4
2
3
4
2
1
2
2
2
4
(i)
442
3
cm
(ii)
440
3
cm
(iii)
443
3
cm
(iv)
446
3
cm
(v)
147
cm
Question
2
2.
Heights of 15 plants are given below. Find the mean.
Height (in cm)
51
53
56
60
77
93
100
No. of plants
2
1
1
2
4
4
1
(i)
1112
15
cm
(ii)
371
5
cm
(iii)
1126
15
cm
(iv)
1141
15
cm
(v)
1111
15
cm
Question
3
3.
Ages of 25 students are given below. Find the mean.
Age (in years)
10
11
12
13
14
15
No. of students
4
4
1
4
5
7
(i)
13
years
(ii)
373
25
years
(iii)
324
25
years
(iv)
323
25
years
(v)
348
25
years
Question
4
4.
Scores of 10 students are given below. Find the mean.
Score
71
75
77
80
82
85
87
No. of students
1
1
3
1
1
1
2
(i)
80
(ii)
409
5
(iii)
399
5
(iv)
401
5
(v)
404
5
Question
5
5.
Rainfall of 10 days are given below. Find the mean.
Rainfall (in mm)
6
9
11
12
14
No. of days
2
2
3
1
2
(i)
113
10
mm
(ii)
123
10
mm
(iii)
52
5
mm
(iv)
21
2
mm
(v)
103
10
mm
Question
6
6.
Temperatures of 15 days are given below. Find the mean.
Temperature (in degree C)
25
26
29
30
31
32
No. of days
3
2
1
5
2
2
(i)
29
°C
(ii)
149
5
°C
(iii)
144
5
°C
(iv)
146
5
°C
(v)
154
5
°C
Question
7
7.
Weights of 30 students are given below. Find the mean.
Weight (in kg)
41
43
44
46
47
48
50
52
53
55
58
No. of students
3
1
3
1
3
3
2
4
3
4
3
(i)
155
3
kg
(ii)
149
3
kg
(iii)
50
kg
(iv)
151
3
kg
(v)
152
3
kg
Question
8
8.
Wages of 25 labourers are given below. Find the mean.
Wage (in rupees)
333
343
359
376
378
403
409
428
448
463
473
484
No. of labourers
2
2
3
1
2
3
2
2
2
2
2
2
(i)
₹
409.20
(ii)
₹
407.60
(iii)
₹
407.40
(iv)
₹
408.20
(v)
₹
407.20
Assignment Key
1) (ii)
2) (v)
3) (iv)
4) (iii)
5) (v)
6) (iii)
7) (ii)
8) (v)
