EduSahara™ Assignment
Name : Mean of Frequency Distribution
Chapter : Statistics
Grade : ICSE Grade VIII
License : Non Commercial Use
Question
1
1.
Heights of 25 students are given below. Find the mean.
Height (in cm)
133
146
151
153
158
160
165
No. of students
4
8
3
4
2
2
2
(i)
3731
25
cm
(ii)
3732
25
cm
(iii)
3733
25
cm
(iv)
3756
25
cm
(v)
3781
25
cm
Question
2
2.
Heights of 25 plants are given below. Find the mean.
Height (in cm)
53
62
68
86
87
89
91
99
No. of plants
3
3
1
1
4
5
5
3
(i)
2094
25
cm
(ii)
409
5
cm
(iii)
2046
25
cm
(iv)
2069
25
cm
(v)
2044
25
cm
Question
3
3.
Ages of 10 students are given below. Find the mean.
Age (in years)
10
12
13
14
15
No. of students
2
2
2
2
2
(i)
66
5
years
(ii)
13
years
(iii)
64
5
years
(iv)
74
5
years
(v)
69
5
years
Question
4
4.
Scores of 15 students are given below. Find the mean.
Score
73
74
77
78
79
82
87
88
No. of students
2
2
1
1
2
2
2
3
(i)
81
(ii)
404
5
(iii)
403
5
(iv)
413
5
(v)
408
5
Question
5
5.
Rainfall of 30 days are given below. Find the mean.
Rainfall (in mm)
6
7
8
10
11
12
15
No. of days
2
3
5
4
4
4
8
(i)
67
6
mm
(ii)
77
6
mm
(iii)
11
mm
(iv)
65
6
mm
(v)
71
6
mm
Question
6
6.
Temperatures of 10 days are given below. Find the mean.
Temperature (in degree C)
26
29
32
33
34
No. of days
1
1
2
2
4
(i)
341
10
°C
(ii)
323
10
°C
(iii)
321
10
°C
(iv)
331
10
°C
(v)
161
5
°C
Question
7
7.
Weights of 25 students are given below. Find the mean.
Weight (in kg)
42
43
48
50
51
52
53
54
56
58
59
No. of students
2
1
6
2
3
2
1
2
3
2
1
(i)
1276
25
kg
(ii)
1278
25
kg
(iii)
1301
25
kg
(iv)
1326
25
kg
(v)
1277
25
kg
Question
8
8.
Wages of 25 labourers are given below. Find the mean.
Wage (in rupees)
328
342
383
410
468
469
477
485
486
No. of labourers
3
1
1
3
3
2
1
6
5
(i)
₹
444.92
(ii)
₹
444.00
(iii)
₹
443.96
(iv)
₹
443.92
(v)
₹
445.92
Question
9
9.
If the mean of the following frequency distribution is
5
13
33
,
find the value of 'x'.
Value
Frequency
1
5
2
3
3
4
4
3
5
4
7
x
8
6
9
2
10
5
(i)
-2
(ii)
1
(iii)
0
(iv)
4
(v)
2
Question
10
10.
If the sum of the following frequency distribution is
29
,
find the value of 'x'.
Value
Frequency
1
2
2
3
3
3
5
4
6
2
7
4
8
3
9
x
10
1
11
3
(i)
2
(ii)
4
(iii)
5
(iv)
6
(v)
3
Assignment Key
1) (i)
2) (v)
3) (iii)
4) (iii)
5) (iv)
6) (iii)
7) (i)
8) (iv)
9) (ii)
10) (ii)
