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)
136
153
165
167
171
172
174
No. of students
2
1
3
3
2
4
5
(i)
3323
20
cm
(ii)
1661
10
cm
(iii)
3361
20
cm
(iv)
3341
20
cm
(v)
3321
20
cm
Question
2
2.
Heights of 15 plants are given below. Find the mean.
Height (in cm)
56
62
70
77
78
84
100
No. of plants
2
2
3
2
2
2
2
(i)
75
cm
(ii)
1139
15
cm
(iii)
1154
15
cm
(iv)
1124
15
cm
(v)
1126
15
cm
Question
3
3.
Ages of 20 students are given below. Find the mean.
Age (in years)
10
11
12
13
14
15
No. of students
8
4
4
2
1
1
(i)
57
5
years
(ii)
227
20
years
(iii)
267
20
years
(iv)
247
20
years
(v)
229
20
years
Question
4
4.
Scores of 10 students are given below. Find the mean.
Score
71
72
74
78
80
84
No. of students
2
2
1
2
1
2
(i)
383
5
(ii)
384
5
(iii)
382
5
(iv)
392
5
(v)
387
5
Question
5
5.
Rainfall of 10 days are given below. Find the mean.
Rainfall (in mm)
5
6
7
10
12
14
15
No. of days
2
2
1
1
1
1
2
(i)
10
mm
(ii)
21
2
mm
(iii)
19
2
mm
(iv)
23
2
mm
Question
6
6.
Temperatures of 10 days are given below. Find the mean.
Temperature (in degree C)
25
26
27
30
31
34
35
No. of days
3
1
1
2
1
1
1
(i)
144
5
°C
(ii)
154
5
°C
(iii)
149
5
°C
(iv)
146
5
°C
(v)
29
°C
Question
7
7.
Weights of 15 students are given below. Find the mean.
Weight (in kg)
42
43
45
48
49
53
57
No. of students
1
3
1
2
3
2
3
(i)
737
15
kg
(ii)
736
15
kg
(iii)
751
15
kg
(iv)
246
5
kg
(v)
766
15
kg
Question
8
8.
Wages of 30 labourers are given below. Find the mean.
Wage (in rupees)
311
333
370
389
398
401
409
428
434
469
485
No. of labourers
5
4
2
4
2
2
2
2
4
2
1
(i)
₹
389.13
(ii)
₹
387.27
(iii)
₹
387.20
(iv)
₹
387.13
(v)
₹
388.13
Assignment Key
1) (v)
2) (iv)
3) (ii)
4) (iii)
5) (iii)
6) (i)
7) (ii)
8) (iv)
