EduSahara™ Assignment
Name : Mean of Frequency Distribution
Chapter : Statistics
Grade : SSC Grade IX
License : Non Commercial Use
Question
1
1.
Heights of 30 students are given below. Find the mean.
Height (in cm)
142
145
147
156
157
167
170
172
174
175
No. of students
2
3
5
2
3
2
5
3
1
4
(i)
4813
30
cm
(ii)
4811
30
cm
(iii)
4871
30
cm
(iv)
4841
30
cm
(v)
802
5
cm
Question
2
2.
Heights of 15 plants are given below. Find the mean.
Height (in cm)
59
79
87
92
96
99
No. of plants
4
4
1
2
2
2
(i)
81
cm
(ii)
1243
15
cm
(iii)
1228
15
cm
(iv)
1213
15
cm
(v)
1214
15
cm
Question
3
3.
Ages of 15 students are given below. Find the mean.
Age (in years)
10
11
13
14
15
No. of students
4
3
3
4
1
(i)
71
5
years
(ii)
61
5
years
(iii)
62
5
years
(iv)
66
5
years
(v)
63
5
years
Question
4
4.
Scores of 15 students are given below. Find the mean.
Score
71
73
76
77
79
80
84
89
90
No. of students
1
1
2
3
1
3
1
2
1
(i)
1199
15
(ii)
1198
15
(iii)
80
(iv)
1228
15
(v)
1213
15
Question
5
5.
Rainfall of 30 days are given below. Find the mean.
Rainfall (in mm)
5
6
7
8
9
10
12
13
14
15
No. of days
4
3
3
4
3
2
2
5
2
2
(i)
10
mm
(ii)
21
2
mm
(iii)
23
2
mm
(iv)
19
2
mm
Question
6
6.
Temperatures of 15 days are given below. Find the mean.
Temperature (in degree C)
25
28
29
31
32
33
34
35
No. of days
1
2
2
3
1
1
4
1
(i)
157
5
°C
(ii)
166
5
°C
(iii)
158
5
°C
(iv)
161
5
°C
(v)
156
5
°C
Question
7
7.
Weights of 15 students are given below. Find the mean.
Weight (in kg)
43
44
45
46
48
55
56
57
60
No. of students
2
2
3
3
1
1
1
1
1
(i)
243
5
kg
(ii)
246
5
kg
(iii)
242
5
kg
(iv)
241
5
kg
(v)
251
5
kg
Question
8
8.
Wages of 10 labourers are given below. Find the mean.
Wage (in rupees)
387
397
421
448
452
475
No. of labourers
1
5
1
1
1
1
(i)
₹
418.80
(ii)
₹
417.00
(iii)
₹
416.80
(iv)
₹
417.80
(v)
₹
417.20
Assignment Key
1) (ii)
2) (iv)
3) (ii)
4) (ii)
5) (iv)
6) (v)
7) (iv)
8) (iii)
