EduSahara™ Assignment
Name : Random Samples Metrics
Chapter : Statistics
Grade : ICSE Grade VII
License : Non Commercial Use
Question
1
1.
The scores obtained by 10 students in a test are given below. Find the range.
18
6
10
11
18
13
3
4
3
12
(i)
3
(ii)
15
(iii)
9
4
5
(iv)
10
1
2
(v)
18
Question
2
2.
The scores obtained by 11 students in a test are given below. Find the minimum score.
15
4
3
14
14
16
15
16
10
3
20
(i)
11
9
11
(ii)
20
(iii)
3
(iv)
17
(v)
14
Question
3
3.
The scores obtained by 13 students in a test are given below. Find the maximum score.
2
11
5
2
12
19
6
10
13
7
18
5
17
(i)
17
(ii)
9
10
13
(iii)
10
(iv)
2
(v)
19
Question
4
4.
The scores obtained by 8 students in a test are given below. Find the mean score.
17
4
1
3
5
17
15
13
(i)
16
(ii)
9
(iii)
17
(iv)
9
3
8
(v)
1
Question
5
5.
If the mean of
3
5
2
x
1
4
is
3
1
2
,
find the value of x.
(i)
6
(ii)
3
(iii)
7
(iv)
5
(v)
9
Question
6
6.
Find the mean of all prime numbers between 50 and 90.
(i)
211
3
(ii)
637
9
(iii)
775
11
(iv)
635
9
(v)
495
7
Question
7
7.
Find the mean of first 8 multiples of 13.
(i)
59
(ii)
233
4
(iii)
119
2
(iv)
117
2
(v)
115
2
Question
8
8.
Find the mean of first 9 whole numbers.
(i)
3
(ii)
5
(iii)
4
(iv)
6
(v)
1
Question
9
9.
Find the mean of first 8 multiples of 12.
(i)
54
(ii)
51
(iii)
53
(iv)
57
(v)
55
Question
10
10.
Find the mean of the first 15 odd numbers.
(i)
15
(ii)
14
(iii)
17
(iv)
12
(v)
16
Question
11
11.
Find the mean of the first 15 even numbers.
(i)
14
(ii)
18
(iii)
16
(iv)
17
(v)
15
Question
12
12.
The marks obtained by 15 students in a test are given below. Find their mean marks.
49
14
14
42
14
2
16
4
42
35
46
29
2
30
50
(i)
129
5
(ii)
339
13
(iii)
389
15
(iv)
439
17
(v)
391
15
Question
13
13.
The marks obtained by 13 students in a test are given below. Find the mean of their marks when the marks of each student is increased by 7.
34
23
31
42
41
2
41
46
30
10
26
36
30
(i)
483
13
(ii)
557
15
(iii)
485
13
(iv)
37
(v)
409
11
Question
14
14.
The marks obtained by 14 students in a test are given below. Find the mean of their marks when the marks of each student is decreased by 2.
32
6
1
19
17
1
23
10
24
26
1
5
19
34
(i)
121
9
(ii)
97
7
(iii)
93
7
(iv)
69
5
(v)
95
7
Question
15
15.
The marks obtained by 11 students in a test are given below. Find the mean of their marks when the marks of each student is doubled.
19
37
42
11
39
19
30
40
49
43
2
(i)
662
11
(ii)
60
(iii)
782
13
(iv)
664
11
(v)
542
9
Question
16
16.
Heights of 12 students (in cm) are given below. Find the mean height.
170
157
157
155
172
132
127
135
150
147
159
166
(i)
609
4
cm
(ii)
305
2
cm
(iii)
617
4
cm
(iv)
611
4
cm
(v)
613
4
cm
Question
17
17.
Heights of 15 plants (in cm) are given below. Find the mean height.
67
86
82
68
56
93
67
84
75
50
76
89
55
97
91
(i)
379
5
cm
(ii)
1166
15
cm
(iii)
1138
15
cm
(iv)
1136
15
cm
(v)
1151
15
cm
Question
18
18.
Ages of 13 students (in years) are given below. Find the mean age.
14
15
10
14
13
13
15
13
13
11
15
12
13
(i)
173
13
years
(ii)
197
13
years
(iii)
172
13
years
(iv)
184
13
years
(v)
171
13
years
Question
19
19.
Rainfall of 15 days (in mm) are given below. Find the mean rainfall.
11
9
12
13
14
7
7
12
11
14
9
15
8
9
12
(i)
164
15
mm
(ii)
163
15
mm
(iii)
193
15
mm
(iv)
11
mm
(v)
178
15
mm
Question
20
20.
Scores of 10 students are given below. Find the mean score.
70
90
90
80
84
81
80
89
77
76
(i)
817
10
(ii)
819
10
(iii)
409
5
(iv)
827
10
(v)
837
10
Question
21
21.
Temperatures of 14 days (in °C) are given below. Find the mean temperature.
25
30
30
31
33
30
29
31
30
28
26
30
31
34
(i)
216
7
°C
(ii)
209
7
°C
(iii)
211
7
°C
(iv)
30
°C
(v)
223
7
°C
Question
22
22.
Weights of 13 students (in kg) are given below. Find the mean weight.
47
48
51
41
60
44
50
41
41
56
60
41
42
(i)
648
13
kg
(ii)
622
13
kg
(iii)
48
kg
(iv)
623
13
kg
(v)
635
13
kg
Question
23
23.
Daily wages of 11 labourers (in ₹) are given below. Find the mean wage.
306
478
489
355
435
301
395
412
499
429
404
(i)
₹
409.55
(ii)
₹
409.45
(iii)
₹
409.36
(iv)
₹
410.36
(v)
₹
411.36
Question
24
24.
The mean of the below random sample is
34
3
10
.
Find the missing quantity.
36
50
29
37
37
19
35
31
x
26
(i)
42
(ii)
46
(iii)
40
(iv)
43
(v)
44
Question
25
25.
Given the mean of
7
samples as
12
1
7
,
what is the mean if a sample value is
increased
by
19
?
(i)
104
7
(ii)
76
5
(iii)
44
3
(iv)
106
7
(v)
102
7
Question
26
26.
Given the mean of
5
samples as
13
3
5
,
what is the mean if a sample value is
decreased
by
15
?
(i)
73
7
(ii)
11
(iii)
51
5
(iv)
53
5
Question
27
27.
Given the mean of
10
samples as
6
,
what is the new mean if two samples
10
and
6
are added ?
(i)
7
(ii)
19
3
(iii)
17
3
(iv)
31
5
Question
28
28.
Given the mean of
12
samples as
4
7
12
,
what is the new mean if two samples
10
and
2
are removed ?
(i)
41
10
(ii)
17
4
(iii)
9
2
(iv)
43
10
(v)
35
8
Question
29
29.
Find the mean of all prime numbers between 20 and 60.
(i)
119
3
(ii)
201
5
(iii)
41
(iv)
121
3
Question
30
30.
Find the mean of all prime numbers between 40 and 90.
(i)
383
6
(ii)
509
8
(iii)
257
4
(iv)
127
2
(v)
385
6
Question
31
31.
Heights of 14 plants (in cm) are given below. Find the mean height.
96
90
85
54
68
68
98
58
93
58
75
68
69
81
(i)
1061
14
cm
(ii)
1075
14
cm
(iii)
1089
14
cm
(iv)
1063
14
cm
(v)
531
7
cm
Assignment Key
1) (ii)
2) (iii)
3) (v)
4) (iv)
5) (i)
6) (iv)
7) (iv)
8) (iii)
9) (i)
10) (i)
11) (iii)
12) (iii)
13) (i)
14) (v)
15) (i)
16) (i)
17) (iv)
18) (v)
19) (ii)
20) (i)
21) (ii)
22) (ii)
23) (iii)
24) (iv)
25) (i)
26) (iv)
27) (ii)
28) (iv)
29) (iv)
30) (i)
31) (i)
