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)
126
130
132
134
135
137
138
140
148
159
172
No. of students
2
3
4
2
2
4
1
3
2
3
4
(i)
289
2
cm
(ii)
143
cm
(iii)
287
2
cm
(iv)
285
2
cm
Question
2
2.
Heights of 20 plants are given below. Find the mean.
Height (in cm)
57
60
72
73
80
86
97
No. of plants
6
4
2
1
1
4
2
(i)
709
10
cm
(ii)
1417
20
cm
(iii)
1419
20
cm
(iv)
1437
20
cm
(v)
1457
20
cm
Question
3
3.
Ages of 25 students are given below. Find the mean.
Age (in years)
10
11
12
13
14
15
No. of students
7
3
5
3
5
2
(i)
327
25
years
(ii)
304
25
years
(iii)
302
25
years
(iv)
303
25
years
(v)
352
25
years
Question
4
4.
Scores of 15 students are given below. Find the mean.
Score
72
74
75
79
83
85
88
89
No. of students
1
1
1
3
3
3
1
2
(i)
1229
15
(ii)
1258
15
(iii)
1243
15
(iv)
82
(v)
1228
15
Question
5
5.
Rainfall of 25 days are given below. Find the mean.
Rainfall (in mm)
5
6
8
9
10
11
12
14
15
No. of days
4
1
2
3
4
4
3
3
1
(i)
247
25
mm
(ii)
296
25
mm
(iii)
271
25
mm
(iv)
246
25
mm
(v)
248
25
mm
Question
6
6.
Temperatures of 25 days are given below. Find the mean.
Temperature (in degree C)
25
26
27
28
29
30
31
32
33
34
35
No. of days
4
1
2
2
1
2
2
2
4
2
3
(i)
758
25
°C
(ii)
757
25
°C
(iii)
781
25
°C
(iv)
756
25
°C
(v)
806
25
°C
Question
7
7.
Weights of 10 students are given below. Find the mean.
Weight (in kg)
41
45
46
55
56
57
58
No. of students
1
1
1
3
1
1
2
(i)
273
5
kg
(ii)
263
5
kg
(iii)
264
5
kg
(iv)
53
kg
(v)
268
5
kg
Question
8
8.
Wages of 20 labourers are given below. Find the mean.
Wage (in rupees)
314
328
333
337
395
417
426
432
497
498
No. of labourers
2
4
2
3
3
2
1
1
1
1
(i)
₹
375.45
(ii)
₹
374.45
(iii)
₹
376.45
(iv)
₹
374.50
(v)
₹
374.55
Assignment Key
1) (iv)
2) (ii)
3) (iii)
4) (v)
5) (iv)
6) (iv)
7) (ii)
8) (ii)
