EduSahara™ Assignment
Name : Mean of Frequency Distribution
Chapter : Statistics
Grade : CBSE Grade IX
License : Non Commercial Use
Question
1
1.
Heights of 15 students are given below. Find the mean.
Height (in cm)
136
138
141
144
153
158
165
168
No. of students
2
2
1
1
2
1
1
5
(i)
2332
15
cm
(ii)
2317
15
cm
(iii)
768
5
cm
(iv)
2303
15
cm
(v)
2302
15
cm
Question
2
2.
Heights of 10 plants are given below. Find the mean.
Height (in cm)
57
67
76
81
89
92
No. of plants
4
1
1
1
2
1
(i)
371
5
cm
(ii)
363
5
cm
(iii)
361
5
cm
(iv)
366
5
cm
(v)
362
5
cm
Question
3
3.
Ages of 25 students are given below. Find the mean.
Age (in years)
11
12
13
14
15
No. of students
4
8
5
5
3
(i)
13
years
(ii)
74
5
years
(iii)
66
5
years
(iv)
64
5
years
(v)
69
5
years
Question
4
4.
Scores of 20 students are given below. Find the mean.
Score
71
72
73
78
80
82
90
No. of students
2
2
3
2
5
4
2
(i)
1609
20
(ii)
1569
20
(iii)
1589
20
(iv)
1571
20
(v)
157
2
Question
5
5.
Rainfall of 25 days are given below. Find the mean.
Rainfall (in mm)
6
8
9
10
11
15
No. of days
7
4
3
6
3
2
(i)
224
25
mm
(ii)
226
25
mm
(iii)
249
25
mm
(iv)
9
mm
(v)
274
25
mm
Question
6
6.
Temperatures of 25 days are given below. Find the mean.
Temperature (in degree C)
25
26
27
28
29
30
31
33
34
35
No. of days
2
1
4
4
4
2
1
1
1
5
(i)
149
5
°C
(ii)
30
°C
(iii)
154
5
°C
(iv)
151
5
°C
(v)
159
5
°C
Question
7
7.
Weights of 10 students are given below. Find the mean.
Weight (in kg)
42
43
45
48
57
No. of students
2
3
2
1
2
(i)
47
kg
(ii)
95
2
kg
(iii)
93
2
kg
(iv)
97
2
kg
Question
8
8.
Wages of 30 labourers are given below. Find the mean.
Wage (in rupees)
331
333
350
351
366
369
376
394
415
439
481
No. of labourers
1
1
7
7
3
1
3
2
3
1
1
(i)
₹
371.63
(ii)
₹
370.70
(iii)
₹
370.63
(iv)
₹
372.63
(v)
₹
370.67
Assignment Key
1) (v)
2) (iii)
3) (iv)
4) (ii)
5) (i)
6) (i)
7) (iii)
8) (iii)
