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 30 students are given below. Find the mean.
Height (in cm)
134
136
141
145
146
151
154
166
No. of students
3
7
4
7
4
1
2
2
(i)
723
5
cm
(ii)
718
5
cm
(iii)
728
5
cm
(iv)
144
cm
(v)
719
5
cm
Question
2
2.
Heights of 10 plants are given below. Find the mean.
Height (in cm)
52
63
69
71
80
100
No. of plants
1
2
1
2
2
2
(i)
769
10
cm
(ii)
751
10
cm
(iii)
75
cm
(iv)
749
10
cm
(v)
759
10
cm
Question
3
3.
Ages of 15 students are given below. Find the mean.
Age (in years)
10
12
13
14
No. of students
2
3
3
7
(i)
194
15
years
(ii)
193
15
years
(iii)
13
years
(iv)
208
15
years
(v)
223
15
years
Question
4
4.
Scores of 30 students are given below. Find the mean.
Score
71
72
73
74
75
76
82
87
89
No. of students
4
4
1
3
4
5
1
4
4
(i)
2393
30
(ii)
2363
30
(iii)
467
6
(iv)
2333
30
(v)
389
5
Question
5
5.
Rainfall of 20 days are given below. Find the mean.
Rainfall (in mm)
5
6
7
9
10
11
12
13
14
15
No. of days
2
1
1
3
2
1
3
4
1
2
(i)
253
20
mm
(ii)
43
4
mm
(iii)
233
20
mm
(iv)
213
20
mm
(v)
107
10
mm
Question
6
6.
Temperatures of 20 days are given below. Find the mean.
Temperature (in degree C)
25
26
30
31
32
33
34
35
No. of days
3
4
3
2
1
2
4
1
(i)
30
°C
(ii)
29
°C
(iii)
31
°C
(iv)
32
°C
(v)
28
°C
Question
7
7.
Weights of 15 students are given below. Find the mean.
Weight (in kg)
40
48
50
51
52
58
No. of students
2
5
1
1
3
3
(i)
751
15
kg
(ii)
251
5
kg
(iii)
752
15
kg
(iv)
781
15
kg
(v)
766
15
kg
Question
8
8.
Wages of 25 labourers are given below. Find the mean.
Wage (in rupees)
305
353
366
371
381
415
438
440
453
No. of labourers
3
2
2
4
4
3
3
1
3
(i)
₹
388.76
(ii)
₹
388.84
(iii)
₹
388.80
(iv)
₹
390.76
(v)
₹
389.76
Question
9
9.
If the mean of the following frequency distribution is
7
5
8
,
find the value of 'x'.
Value
Frequency
3
3
4
x
5
6
6
3
7
2
8
3
9
2
10
3
12
2
13
5
(i)
0
(ii)
2
(iii)
3
(iv)
4
(v)
6
Assignment Key
1) (ii)
2) (iv)
3) (ii)
4) (iv)
5) (iv)
6) (i)
7) (i)
8) (i)
9) (iii)
