EduSahara™ Assignment
Name : Mean of Frequency Distribution
Chapter : Statistics
Grade : ICSE Grade VII
License : Non Commercial Use
Question
1
1.
Heights of 30 students are given below. Find the mean.
Height (in cm)
148
151
154
158
160
162
169
No. of students
4
4
5
4
4
5
4
(i)
2377
15
cm
(ii)
2363
15
cm
(iii)
788
5
cm
(iv)
2392
15
cm
(v)
2362
15
cm
Question
2
2.
Heights of 20 plants are given below. Find the mean.
Height (in cm)
53
56
60
64
65
68
80
81
87
88
99
No. of plants
1
4
1
1
2
2
1
1
1
3
3
(i)
74
cm
(ii)
379
5
cm
(iii)
369
5
cm
(iv)
371
5
cm
(v)
374
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
1
4
3
8
6
8
(i)
229
15
years
(ii)
40
3
years
(iii)
199
15
years
(iv)
67
5
years
(v)
214
15
years
Question
4
4.
Scores of 30 students are given below. Find the mean.
Score
70
72
73
74
76
79
88
No. of students
4
7
5
3
4
2
5
(i)
455
6
(ii)
2273
30
(iii)
379
5
(iv)
2333
30
(v)
2303
30
Question
5
5.
Rainfall of 20 days are given below. Find the mean.
Rainfall (in mm)
6
7
8
9
10
11
12
13
14
No. of days
3
3
1
3
1
4
2
1
2
(i)
39
4
mm
(ii)
213
20
mm
(iii)
193
20
mm
(iv)
97
10
mm
(v)
233
20
mm
Question
6
6.
Temperatures of 25 days are given below. Find the mean.
Temperature (in degree C)
25
26
27
28
29
30
31
33
34
35
No. of days
2
4
2
4
2
2
1
2
2
4
(i)
149
5
°C
(ii)
743
25
°C
(iii)
793
25
°C
(iv)
768
25
°C
(v)
744
25
°C
Question
7
7.
Weights of 25 students are given below. Find the mean.
Weight (in kg)
42
44
46
49
53
55
56
57
58
59
60
No. of students
2
3
2
3
1
2
1
1
3
3
4
(i)
1347
25
kg
(ii)
1322
25
kg
(iii)
1372
25
kg
(iv)
1323
25
kg
(v)
1324
25
kg
Question
8
8.
Wages of 10 labourers are given below. Find the mean.
Wage (in rupees)
301
344
353
384
406
439
453
No. of labourers
1
1
2
1
3
1
1
(i)
₹
385.50
(ii)
₹
385.00
(iii)
₹
384.50
(iv)
₹
386.50
Question
9
9.
If the sum of the following frequency distribution is
25
,
find the value of 'x'.
Value
Frequency
3
3
4
4
6
3
7
1
8
3
9
3
10
x
(i)
7
(ii)
8
(iii)
9
(iv)
11
(v)
6
Question
10
10.
If the mean of the following frequency distribution is
9
31
34
,
find the value of 'x'.
Value
Frequency
3
2
4
1
5
x
6
1
7
3
9
4
10
3
11
4
12
3
13
3
14
5
15
2
(i)
2
(ii)
3
(iii)
4
(iv)
1
(v)
6
Assignment Key
1) (v)
2) (iii)
3) (iii)
4) (ii)
5) (iii)
6) (ii)
7) (ii)
8) (iii)
9) (ii)
10) (ii)
