EduSahara™ Assignment
Name : Mean of Frequency Distribution
Chapter : Statistics
Grade : SSC Grade IX
License : Non Commercial Use
Question
1
1.
Heights of 15 students are given below. Find the mean.
Height (in cm)
134
137
141
144
145
154
159
160
173
174
No. of students
2
1
1
1
2
3
1
1
1
2
(i)
2282
15
cm
(ii)
761
5
cm
(iii)
2297
15
cm
(iv)
2284
15
cm
(v)
2312
15
cm
Question
2
2.
Heights of 30 plants are given below. Find the mean.
Height (in cm)
50
55
58
60
64
70
74
87
89
94
96
99
No. of plants
4
1
2
2
2
2
2
3
2
2
3
5
(i)
2317
30
cm
(ii)
1159
15
cm
(iii)
773
10
cm
(iv)
2377
30
cm
(v)
2347
30
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
4
5
5
7
6
3
(i)
13
years
(ii)
25
2
years
(iii)
27
2
years
(iv)
29
2
years
Question
4
4.
Scores of 15 students are given below. Find the mean.
Score
70
73
78
81
82
85
87
89
No. of students
2
1
2
3
1
2
2
2
(i)
1216
15
(ii)
1217
15
(iii)
1246
15
(iv)
406
5
(v)
1231
15
Question
5
5.
Rainfall of 15 days are given below. Find the mean.
Rainfall (in mm)
5
6
8
9
11
12
13
15
No. of days
5
2
1
2
1
1
2
1
(i)
127
15
mm
(ii)
128
15
mm
(iii)
43
5
mm
(iv)
142
15
mm
(v)
157
15
mm
Question
6
6.
Temperatures of 25 days are given below. Find the mean.
Temperature (in degree C)
25
27
28
29
30
31
32
33
34
35
No. of days
2
3
2
3
2
1
2
1
4
5
(i)
774
25
°C
(ii)
798
25
°C
(iii)
823
25
°C
(iv)
773
25
°C
(v)
31
°C
Question
7
7.
Weights of 25 students are given below. Find the mean.
Weight (in kg)
43
44
45
48
49
50
56
No. of students
5
2
1
3
7
3
4
(i)
1209
25
kg
(ii)
1234
25
kg
(iii)
1259
25
kg
(iv)
242
5
kg
(v)
1211
25
kg
Question
8
8.
Wages of 10 labourers are given below. Find the mean.
Wage (in rupees)
351
395
409
462
481
487
No. of labourers
2
2
1
1
3
1
(i)
₹
429.40
(ii)
₹
431.30
(iii)
₹
429.50
(iv)
₹
429.30
(v)
₹
430.30
Assignment Key
1) (i)
2) (i)
3) (ii)
4) (i)
5) (i)
6) (iv)
7) (i)
8) (iv)
