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)
127
133
143
146
154
170
171
172
No. of students
2
4
5
5
1
3
4
6
(i)
1537
10
cm
(ii)
1547
10
cm
(iii)
1557
10
cm
(iv)
769
5
cm
(v)
1539
10
cm
Question
2
2.
Heights of 15 plants are given below. Find the mean.
Height (in cm)
52
62
63
72
84
85
95
No. of plants
4
3
2
1
2
2
1
(i)
69
cm
(ii)
206
3
cm
(iii)
211
3
cm
(iv)
205
3
cm
(v)
208
3
cm
Question
3
3.
Ages of 10 students are given below. Find the mean.
Age (in years)
10
11
12
13
15
No. of students
1
2
1
1
5
(i)
66
5
years
(ii)
67
5
years
(iii)
68
5
years
(iv)
71
5
years
(v)
76
5
years
Question
4
4.
Scores of 30 students are given below. Find the mean.
Score
72
73
77
79
81
84
85
86
88
89
90
No. of students
3
1
5
2
5
3
2
3
1
3
2
(i)
1226
15
(ii)
1256
15
(iii)
1241
15
(iv)
1228
15
(v)
409
5
Question
5
5.
Rainfall of 10 days are given below. Find the mean.
Rainfall (in mm)
5
6
8
12
13
15
No. of days
1
2
1
2
2
2
(i)
11
mm
(ii)
23
2
mm
(iii)
21
2
mm
(iv)
25
2
mm
Question
6
6.
Temperatures of 20 days are given below. Find the mean.
Temperature (in degree C)
26
27
29
30
31
32
35
No. of days
4
1
3
4
2
1
5
(i)
609
20
°C
(ii)
647
20
°C
(iii)
607
20
°C
(iv)
152
5
°C
(v)
627
20
°C
Question
7
7.
Weights of 10 students are given below. Find the mean.
Weight (in kg)
40
42
46
50
52
55
No. of students
2
3
2
1
1
1
(i)
95
2
kg
(ii)
93
2
kg
(iii)
46
kg
(iv)
91
2
kg
Question
8
8.
Wages of 25 labourers are given below. Find the mean.
Wage (in rupees)
344
360
365
396
431
437
444
448
457
469
No. of labourers
4
4
1
1
3
3
1
2
2
4
(i)
₹
412.48
(ii)
₹
412.52
(iii)
₹
414.44
(iv)
₹
413.44
(v)
₹
412.44
Question
9
9.
If the mean of the following frequency distribution is
9
12
31
,
find the value of 'x'.
Value
Frequency
5
4
6
5
7
2
8
x
9
2
10
2
11
5
12
1
13
2
14
3
15
2
(i)
2
(ii)
6
(iii)
4
(iv)
1
(v)
3
Assignment Key
1) (i)
2) (iv)
3) (i)
4) (i)
5) (iii)
6) (iii)
7) (iv)
8) (v)
9) (v)