EduSahara™ Assignment
Name : Mean of Frequency Distribution
Chapter : Statistics
Grade : SSC Grade IX
License : Non Commercial Use
Question
1
1.
Heights of 25 students are given below. Find the mean.
Height (in cm)
136
141
145
149
155
170
172
No. of students
3
2
6
6
4
2
2
(i)
3758
25
cm
(ii)
3808
25
cm
(iii)
3783
25
cm
(iv)
752
5
cm
(v)
3759
25
cm
Question
2
2.
Heights of 10 plants are given below. Find the mean.
Height (in cm)
51
53
57
63
68
76
77
79
94
No. of plants
1
1
2
1
1
1
1
1
1
(i)
137
2
cm
(ii)
68
cm
(iii)
135
2
cm
(iv)
139
2
cm
Question
3
3.
Ages of 20 students are given below. Find the mean.
Age (in years)
10
11
12
13
14
15
No. of students
3
3
5
3
4
2
(i)
62
5
years
(ii)
64
5
years
(iii)
72
5
years
(iv)
67
5
years
(v)
63
5
years
Question
4
4.
Scores of 25 students are given below. Find the mean.
Score
72
73
74
75
77
80
81
82
84
90
No. of students
3
1
1
1
3
1
4
3
6
2
(i)
2028
25
(ii)
2003
25
(iii)
401
5
(iv)
2004
25
(v)
2053
25
Question
5
5.
Rainfall of 30 days are given below. Find the mean.
Rainfall (in mm)
5
6
7
8
10
12
14
15
No. of days
5
2
3
4
2
5
3
6
(i)
181
15
mm
(ii)
152
15
mm
(iii)
166
15
mm
(iv)
51
5
mm
(v)
151
15
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
33
34
35
No. of days
3
2
2
3
3
3
4
3
6
1
(i)
151
5
°C
(ii)
482
15
°C
(iii)
467
15
°C
(iv)
454
15
°C
(v)
452
15
°C
Question
7
7.
Weights of 10 students are given below. Find the mean.
Weight (in kg)
40
46
47
49
50
51
54
No. of students
1
1
1
2
1
1
3
(i)
257
5
kg
(ii)
252
5
kg
(iii)
248
5
kg
(iv)
249
5
kg
(v)
247
5
kg
Question
8
8.
Wages of 30 labourers are given below. Find the mean.
Wage (in rupees)
309
320
359
372
421
464
498
499
No. of labourers
2
4
2
4
6
1
6
5
(i)
₹
419.23
(ii)
₹
419.27
(iii)
₹
419.30
(iv)
₹
421.23
(v)
₹
420.23
Assignment Key
1) (i)
2) (iii)
3) (i)
4) (ii)
5) (v)
6) (v)
7) (v)
8) (i)
