EduSahara™ Assignment
Name : Mean of Frequency Distribution
Chapter : Statistics
Grade : CBSE Grade IX
License : Non Commercial Use
Question
1
1.
Heights of 30 students are given below. Find the mean.
Height (in cm)
130
132
135
141
168
169
171
No. of students
3
6
6
4
2
4
5
(i)
2212
15
cm
(ii)
4423
30
cm
(iii)
4483
30
cm
(iv)
295
2
cm
(v)
4453
30
cm
Question
2
2.
Heights of 10 plants are given below. Find the mean.
Height (in cm)
78
85
88
94
99
No. of plants
1
3
2
3
1
(i)
88
cm
(ii)
91
cm
(iii)
90
cm
(iv)
87
cm
(v)
89
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
2
3
4
6
6
(i)
324
25
years
(ii)
349
25
years
(iii)
326
25
years
(iv)
13
years
(v)
374
25
years
Question
4
4.
Scores of 15 students are given below. Find the mean.
Score
73
81
82
83
84
85
87
89
No. of students
3
1
3
1
1
1
3
2
(i)
1238
15
(ii)
1267
15
(iii)
413
5
(iv)
1252
15
(v)
1237
15
Question
5
5.
Rainfall of 25 days are given below. Find the mean.
Rainfall (in mm)
6
7
8
10
13
14
15
No. of days
2
4
4
4
7
3
1
(i)
53
5
mm
(ii)
62
5
mm
(iii)
57
5
mm
(iv)
54
5
mm
(v)
52
5
mm
Question
6
6.
Temperatures of 30 days are given below. Find the mean.
Temperature (in degree C)
26
27
28
29
30
31
32
33
34
35
No. of days
5
4
2
4
2
4
4
1
1
3
(i)
30
°C
(ii)
154
5
°C
(iii)
159
5
°C
(iv)
149
5
°C
(v)
151
5
°C
Question
7
7.
Weights of 10 students are given below. Find the mean.
Weight (in kg)
40
46
47
49
52
53
55
58
No. of students
1
1
1
2
2
1
1
1
(i)
501
10
kg
(ii)
521
10
kg
(iii)
511
10
kg
(iv)
251
5
kg
(v)
503
10
kg
Question
8
8.
Wages of 25 labourers are given below. Find the mean.
Wage (in rupees)
343
360
365
411
432
433
475
478
No. of labourers
1
1
6
3
3
6
3
2
(i)
₹
416.04
(ii)
₹
416.08
(iii)
₹
418.04
(iv)
₹
417.04
(v)
₹
416.12
Assignment Key
1) (ii)
2) (v)
3) (i)
4) (v)
5) (v)
6) (iv)
7) (i)
8) (i)
