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)
125
140
142
145
161
163
167
170
No. of students
2
3
3
1
2
1
1
2
(i)
2263
15
cm
(ii)
2233
15
cm
(iii)
2248
15
cm
(iv)
149
cm
(v)
2234
15
cm
Question
2
2.
Heights of 20 plants are given below. Find the mean.
Height (in cm)
60
67
68
70
74
77
82
83
100
No. of plants
4
3
1
1
2
1
1
4
3
(i)
76
cm
(ii)
769
10
cm
(iii)
779
10
cm
(iv)
759
10
cm
(v)
761
10
cm
Question
3
3.
Ages of 15 students are given below. Find the mean.
Age (in years)
10
11
12
13
14
15
No. of students
6
3
2
2
1
1
(i)
173
15
years
(ii)
187
15
years
(iii)
172
15
years
(iv)
202
15
years
(v)
58
5
years
Question
4
4.
Scores of 15 students are given below. Find the mean.
Score
76
81
82
83
88
No. of students
3
4
2
2
4
(i)
1249
15
(ii)
247
3
(iii)
412
5
(iv)
1264
15
(v)
1234
15
Question
5
5.
Rainfall of 15 days are given below. Find the mean.
Rainfall (in mm)
5
6
8
9
10
11
12
13
15
No. of days
1
2
3
2
2
1
2
1
1
(i)
172
15
mm
(ii)
157
15
mm
(iii)
48
5
mm
(iv)
143
15
mm
(v)
142
15
mm
Question
6
6.
Temperatures of 30 days are given below. Find the mean.
Temperature (in degree C)
27
28
29
30
31
32
33
35
No. of days
4
6
6
2
4
2
3
3
(i)
481
15
°C
(ii)
466
15
°C
(iii)
452
15
°C
(iv)
451
15
°C
(v)
151
5
°C
Question
7
7.
Weights of 20 students are given below. Find the mean.
Weight (in kg)
40
43
46
49
51
53
60
No. of students
1
4
3
4
1
3
4
(i)
50
kg
(ii)
251
5
kg
(iii)
249
5
kg
(iv)
259
5
kg
(v)
254
5
kg
Question
8
8.
Wages of 30 labourers are given below. Find the mean.
Wage (in rupees)
315
331
335
351
368
370
414
464
No. of labourers
3
3
4
5
1
2
4
8
(i)
₹
384.63
(ii)
₹
385.63
(iii)
₹
383.70
(iv)
₹
383.67
(v)
₹
383.63
Question
9
9.
If the mean of the following frequency distribution is
6
7
10
,
find the value of 'x'.
Value
Frequency
1
3
2
2
3
4
4
1
5
2
6
3
7
2
8
2
9
2
10
1
11
5
12
2
13
x
(i)
-2
(ii)
0
(iii)
4
(iv)
1
(v)
2
Assignment Key
1) (ii)
2) (iv)
3) (iii)
4) (v)
5) (v)
6) (iv)
7) (iii)
8) (v)
9) (iv)
