EduSahara™ Assignment
Name : Mean of Frequency Distribution
Chapter : Statistics
Grade : CBSE Grade IX
License : Non Commercial Use
Question
1
1.
Heights of 20 students are given below. Find the mean.
Height (in cm)
129
131
135
144
157
167
No. of students
4
8
1
4
2
1
(i)
138
cm
(ii)
691
5
cm
(iii)
699
5
cm
(iv)
694
5
cm
(v)
689
5
cm
Question
2
2.
Heights of 25 plants are given below. Find the mean.
Height (in cm)
58
61
67
68
74
78
No. of plants
2
6
7
4
3
3
(i)
1679
25
cm
(ii)
336
5
cm
(iii)
1704
25
cm
(iv)
1729
25
cm
(v)
1681
25
cm
Question
3
3.
Ages of 10 students are given below. Find the mean.
Age (in years)
10
11
12
13
14
No. of students
2
1
2
3
2
(i)
62
5
years
(ii)
61
5
years
(iii)
66
5
years
(iv)
71
5
years
(v)
63
5
years
Question
4
4.
Scores of 10 students are given below. Find the mean.
Score
77
80
81
83
86
90
No. of students
1
2
3
1
2
1
(i)
165
2
(ii)
167
2
(iii)
169
2
(iv)
83
Question
5
5.
Rainfall of 20 days are given below. Find the mean.
Rainfall (in mm)
6
7
8
9
10
11
12
13
14
15
No. of days
3
3
1
1
4
2
2
1
2
1
(i)
109
10
mm
(ii)
101
10
mm
(iii)
119
10
mm
(iv)
99
10
mm
(v)
10
mm
Question
6
6.
Temperatures of 30 days are given below. Find the mean.
Temperature (in degree C)
25
27
28
29
30
31
32
33
34
35
No. of days
1
4
2
5
4
1
2
2
5
4
(i)
187
6
°C
(ii)
191
6
°C
(iii)
185
6
°C
(iv)
197
6
°C
(v)
31
°C
Question
7
7.
Weights of 10 students are given below. Find the mean.
Weight (in kg)
42
45
46
47
51
54
57
58
No. of students
1
1
1
1
1
2
2
1
(i)
521
10
kg
(ii)
531
10
kg
(iii)
513
10
kg
(iv)
511
10
kg
(v)
256
5
kg
Question
8
8.
Wages of 25 labourers are given below. Find the mean.
Wage (in rupees)
340
356
378
391
435
442
451
472
No. of labourers
4
2
3
3
3
3
2
5
(i)
₹
410.92
(ii)
₹
410.88
(iii)
₹
412.88
(iv)
₹
411.88
(v)
₹
410.96
Assignment Key
1) (v)
2) (i)
3) (ii)
4) (i)
5) (iv)
6) (iii)
7) (iv)
8) (ii)
