EduSahara™ Assignment
Name : Mean of Frequency Distribution
Chapter : Statistics
Grade : CBSE Grade IX
License : Non Commercial Use
Question
1
1.
Heights of 10 students are given below. Find the mean.
Height (in cm)
130
136
137
138
157
170
No. of students
1
2
2
2
2
1
(i)
144
cm
(ii)
719
5
cm
(iii)
718
5
cm
(iv)
723
5
cm
(v)
728
5
cm
Question
2
2.
Heights of 30 plants are given below. Find the mean.
Height (in cm)
50
56
68
72
75
88
90
91
95
98
No. of plants
1
1
7
2
3
1
8
2
3
2
(i)
404
5
cm
(ii)
1241
15
cm
(iii)
1213
15
cm
(iv)
1211
15
cm
(v)
1226
15
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
8
3
6
4
4
5
(i)
214
15
years
(ii)
37
3
years
(iii)
62
5
years
(iv)
184
15
years
(v)
199
15
years
Question
4
4.
Scores of 10 students are given below. Find the mean.
Score
73
77
79
82
83
85
86
88
No. of students
1
1
1
2
1
2
1
1
(i)
84
(ii)
81
(iii)
83
(iv)
80
(v)
82
Question
5
5.
Rainfall of 10 days are given below. Find the mean.
Rainfall (in mm)
5
7
8
11
12
13
14
No. of days
2
1
1
1
1
3
1
(i)
51
5
mm
(ii)
103
10
mm
(iii)
111
10
mm
(iv)
121
10
mm
(v)
101
10
mm
Question
6
6.
Temperatures of 30 days are given below. Find the mean.
Temperature (in degree C)
26
27
28
31
32
34
35
No. of days
4
3
6
7
1
6
3
(i)
911
30
°C
(ii)
913
30
°C
(iii)
971
30
°C
(iv)
941
30
°C
(v)
152
5
°C
Question
7
7.
Weights of 20 students are given below. Find the mean.
Weight (in kg)
40
41
43
44
45
46
50
53
56
No. of students
2
2
3
1
3
3
2
1
3
(i)
931
20
kg
(ii)
969
20
kg
(iii)
93
2
kg
(iv)
949
20
kg
(v)
929
20
kg
Question
8
8.
Wages of 15 labourers are given below. Find the mean.
Wage (in rupees)
309
320
331
345
364
394
412
413
451
464
No. of labourers
1
2
2
2
2
1
1
2
1
1
(i)
₹
371.87
(ii)
₹
373.73
(iii)
₹
372.73
(iv)
₹
371.73
(v)
₹
371.80
Assignment Key
1) (iii)
2) (iv)
3) (iv)
4) (v)
5) (v)
6) (i)
7) (v)
8) (iv)
