EduSahara™ Assignment
Name : Mean of Frequency Distribution
Chapter : Statistics
Grade : CBSE Grade IX
License : Non Commercial Use
Question
1
1.
Heights of 25 students are given below. Find the mean.
Height (in cm)
144
148
149
164
165
168
169
172
174
No. of students
2
2
5
1
3
1
4
2
5
(i)
4047
25
cm
(ii)
4096
25
cm
(iii)
4046
25
cm
(iv)
4071
25
cm
(v)
4048
25
cm
Question
2
2.
Heights of 30 plants are given below. Find the mean.
Height (in cm)
55
64
78
82
84
88
89
93
No. of plants
5
4
1
4
7
4
3
2
(i)
233
3
cm
(ii)
236
3
cm
(iii)
235
3
cm
(iv)
78
cm
(v)
239
3
cm
Question
3
3.
Ages of 30 students are given below. Find the mean.
Age (in years)
10
11
12
13
14
15
No. of students
3
3
6
3
8
7
(i)
391
30
years
(ii)
421
30
years
(iii)
451
30
years
(iv)
131
10
years
(v)
196
15
years
Question
4
4.
Scores of 20 students are given below. Find the mean.
Score
72
73
75
79
81
82
83
84
86
87
89
90
No. of students
3
1
2
3
2
1
1
2
1
1
2
1
(i)
403
5
(ii)
408
5
(iii)
81
(iv)
413
5
(v)
404
5
Question
5
5.
Rainfall of 25 days are given below. Find the mean.
Rainfall (in mm)
6
8
10
11
12
13
14
15
No. of days
3
2
3
1
5
4
3
4
(i)
289
25
mm
(ii)
58
5
mm
(iii)
314
25
mm
(iv)
291
25
mm
(v)
339
25
mm
Question
6
6.
Temperatures of 20 days are given below. Find the mean.
Temperature (in degree C)
25
26
27
28
29
30
31
32
33
No. of days
2
3
2
1
1
2
4
2
3
(i)
59
2
°C
(ii)
293
10
°C
(iii)
303
10
°C
(iv)
147
5
°C
(v)
313
10
°C
Question
7
7.
Weights of 15 students are given below. Find the mean.
Weight (in kg)
40
44
48
51
54
58
60
No. of students
2
2
3
1
4
2
1
(i)
51
kg
(ii)
151
3
kg
(iii)
152
3
kg
(iv)
157
3
kg
(v)
154
3
kg
Question
8
8.
Wages of 25 labourers are given below. Find the mean.
Wage (in rupees)
305
324
329
332
350
354
358
364
No. of labourers
3
2
2
4
3
5
3
3
(i)
₹
343.40
(ii)
₹
341.60
(iii)
₹
341.40
(iv)
₹
341.80
(v)
₹
342.40
Assignment Key
1) (iii)
2) (i)
3) (i)
4) (i)
5) (i)
6) (ii)
7) (ii)
8) (iii)
