EduSahara™ Assignment
Name : Mean of Frequency Distribution
Chapter : Mean and Median of Ungrouped Data
Grade : ICSE Grade IX
License : Non Commercial Use
Question
1
1.
Heights of 15 students are given below. Find the mean.
Height (in cm)
130
134
147
151
158
162
169
172
No. of students
2
3
1
1
3
3
1
1
(i)
2261
15
cm
(ii)
754
5
cm
(iii)
2291
15
cm
(iv)
2263
15
cm
(v)
2276
15
cm
Question
2
2.
Heights of 10 plants are given below. Find the mean.
Height (in cm)
55
66
68
71
80
90
No. of plants
1
1
4
1
1
2
(i)
363
5
cm
(ii)
367
5
cm
(iii)
372
5
cm
(iv)
364
5
cm
(v)
362
5
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
5
3
8
8
2
4
(i)
401
30
years
(ii)
431
30
years
(iii)
371
30
years
(iv)
373
30
years
(v)
62
5
years
Question
4
4.
Scores of 20 students are given below. Find the mean.
Score
70
72
73
75
79
80
82
84
85
86
No. of students
1
1
2
3
1
1
2
5
1
3
(i)
1601
20
(ii)
1639
20
(iii)
1599
20
(iv)
1619
20
(v)
80
Question
5
5.
Rainfall of 20 days are given below. Find the mean.
Rainfall (in mm)
5
7
8
10
12
14
15
No. of days
3
3
3
3
5
2
1
(i)
233
20
mm
(ii)
193
20
mm
(iii)
39
4
mm
(iv)
97
10
mm
(v)
213
20
mm
Question
6
6.
Temperatures of 30 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
5
2
3
4
1
2
3
2
4
1
3
(i)
917
30
°C
(ii)
887
30
°C
(iii)
947
30
°C
(iv)
148
5
°C
(v)
889
30
°C
Question
7
7.
Weights of 10 students are given below. Find the mean.
Weight (in kg)
50
51
54
58
No. of students
5
1
1
3
(i)
53
kg
(ii)
531
10
kg
(iii)
529
10
kg
(iv)
549
10
kg
(v)
539
10
kg
Question
8
8.
Wages of 25 labourers are given below. Find the mean.
Wage (in rupees)
310
318
331
344
398
403
467
No. of labourers
8
2
2
7
2
3
1
(i)
₹
346.40
(ii)
₹
348.32
(iii)
₹
347.32
(iv)
₹
346.36
(v)
₹
346.32
Question
9
9.
If the mean of the following frequency distribution is
7
12
19
,
find the value of 'x'.
Value
Frequency
5
4
6
9
7
5
8
x
9
9
10
6
(i)
7
(ii)
5
(iii)
3
(iv)
4
(v)
6
Assignment Key
1) (i)
2) (v)
3) (iii)
4) (iii)
5) (ii)
6) (ii)
7) (iii)
8) (v)
9) (ii)
