EduSahara™ Assignment
Name : Random Samples Metrics
Chapter : Statistics
Grade : ICSE Grade VII
License : Non Commercial Use
Question
1
1.
The scores obtained by 7 students in a test are given below. Find the range.
1
11
10
3
18
18
11
(i)
10
2
7
(ii)
11
(iii)
17
(iv)
1
(v)
18
Question
2
2.
The scores obtained by 10 students in a test are given below. Find the minimum score.
10
3
6
3
5
15
1
13
6
10
(i)
15
(ii)
14
(iii)
1
(iv)
7
1
5
(v)
6
Question
3
3.
The scores obtained by 6 students in a test are given below. Find the maximum score.
13
5
18
2
12
15
(i)
16
(ii)
10
5
6
(iii)
18
(iv)
12
1
2
(v)
2
Question
4
4.
The scores obtained by 6 students in a test are given below. Find the mean score.
8
3
12
1
13
17
(i)
1
(ii)
10
(iii)
17
(iv)
9
(v)
16
Question
5
5.
If the mean of
4
1
2
x
7
6
is
3
5
6
,
find the value of x.
(i)
4
(ii)
3
(iii)
6
(iv)
2
(v)
1
Question
6
6.
Find the mean of all prime numbers between 50 and 70.
(i)
60
(ii)
62
(iii)
57
(iv)
61
(v)
59
Question
7
7.
Find the mean of first 9 multiples of 20.
(i)
99
(ii)
101
(iii)
98
(iv)
100
(v)
102
Question
8
8.
Find the mean of first 8 whole numbers.
(i)
4
(ii)
13
4
(iii)
5
2
(iv)
7
2
(v)
9
2
Question
9
9.
Find the mean of first 6 multiples of 12.
(i)
39
(ii)
43
(iii)
41
(iv)
42
(v)
44
Question
10
10.
Find the mean of the first 10 odd numbers.
(i)
10
(ii)
7
(iii)
11
(iv)
13
(v)
9
Question
11
11.
Find the mean of the first 20 even numbers.
(i)
24
(ii)
21
(iii)
22
(iv)
20
(v)
19
Question
12
12.
The marks obtained by 11 students in a test are given below. Find their mean marks.
24
40
50
15
29
35
37
5
8
34
9
(i)
27
(ii)
24
(iii)
26
(iv)
25
(v)
28
Question
13
13.
The marks obtained by 15 students in a test are given below. Find the mean of their marks when the marks of each student is increased by 1.
29
31
1
19
10
43
2
15
40
41
12
38
7
35
21
(i)
313
13
(ii)
405
17
(iii)
359
15
(iv)
119
5
(v)
361
15
Question
14
14.
The marks obtained by 10 students in a test are given below. Find the mean of their marks when the marks of each student is decreased by 4.
24
30
49
28
21
35
8
12
37
1
(i)
21
(ii)
41
2
(iii)
81
4
(iv)
39
2
(v)
43
2
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.
46
24
26
32
26
9
39
19
23
50
24
(i)
750
13
(ii)
634
11
(iii)
636
11
(iv)
58
Question
16
16.
Heights of 13 students (in cm) are given below. Find the mean height.
175
160
166
170
154
126
167
127
145
127
148
126
146
(i)
151
cm
(ii)
150
cm
(iii)
147
cm
(iv)
149
cm
(v)
148
cm
Question
17
17.
Heights of 14 plants (in cm) are given below. Find the mean height.
64
58
57
82
88
65
79
72
79
96
74
67
90
76
(i)
524
7
cm
(ii)
1061
14
cm
(iii)
1049
14
cm
(iv)
1047
14
cm
(v)
1075
14
cm
Question
18
18.
Ages of 15 students (in years) are given below. Find the mean age.
13
15
13
11
12
13
12
11
11
11
15
15
11
14
12
(i)
68
5
years
(ii)
63
5
years
(iii)
64
5
years
(iv)
73
5
years
(v)
13
years
Question
19
19.
Rainfall of 15 days (in mm) are given below. Find the mean rainfall.
13
12
9
11
13
8
7
11
8
7
13
14
7
7
7
(i)
49
5
mm
(ii)
10
mm
(iii)
59
5
mm
(iv)
51
5
mm
(v)
54
5
mm
Question
20
20.
Scores of 13 students are given below. Find the mean score.
86
81
87
86
84
78
90
85
88
85
87
85
72
(i)
1120
13
(ii)
1107
13
(iii)
1096
13
(iv)
1094
13
(v)
1095
13
Question
21
21.
Temperatures of 12 days (in °C) are given below. Find the mean temperature.
31
33
34
35
29
26
27
35
32
33
27
33
(i)
63
2
°C
(ii)
125
4
°C
(iii)
133
4
°C
(iv)
127
4
°C
(v)
129
4
°C
Question
22
22.
Weights of 12 students (in kg) are given below. Find the mean weight.
56
50
45
58
44
51
50
44
49
50
59
55
(i)
611
12
kg
(ii)
635
12
kg
(iii)
623
12
kg
(iv)
51
kg
(v)
613
12
kg
Question
23
23.
Daily wages of 10 labourers (in ₹) are given below. Find the mean wage.
471
444
319
496
388
448
486
330
414
360
(i)
₹
415.80
(ii)
₹
416.60
(iii)
₹
416.00
(iv)
₹
417.60
(v)
₹
415.60
Question
24
24.
The mean of the below random sample is
30
3
5
.
Find the missing quantity.
48
38
27
31
33
43
15
x
21
25
(i)
25
(ii)
24
(iii)
26
(iv)
22
(v)
27
Question
25
25.
Given the mean of
6
samples as
7
2
3
,
what is the mean if a sample value is
increased
by
10
?
(i)
26
3
(ii)
46
5
(iii)
10
(iv)
28
3
Question
26
26.
Given the mean of
5
samples as
14
2
5
,
what is the mean if a sample value is
decreased
by
14
?
(i)
12
(ii)
58
5
(iii)
80
7
(iv)
56
5
Question
27
27.
Given the mean of
10
samples as
4
7
10
,
what is the new mean if two samples
5
and
5
are added ?
(i)
9
2
(ii)
21
4
(iii)
11
2
(iv)
19
4
(v)
17
4
Question
28
28.
Given the mean of
12
samples as
4
,
what is the new mean if two samples
3
and
6
are removed ?
(i)
37
10
(ii)
41
10
(iii)
15
4
(iv)
33
8
(v)
39
10
Question
29
29.
Find the mean of all prime numbers between 50 and 60.
(i)
54
(ii)
59
(iii)
55
(iv)
57
(v)
56
Question
30
30.
Find the mean of all prime numbers between 10 and 60.
(i)
423
13
(ii)
425
13
(iii)
421
13
(iv)
487
15
(v)
359
11
Question
31
31.
Heights of 13 plants (in cm) are given below. Find the mean height.
55
67
61
80
55
83
80
77
55
93
100
61
59
(i)
952
13
cm
(ii)
939
13
cm
(iii)
926
13
cm
(iv)
928
13
cm
(v)
927
13
cm
Assignment Key
1) (iii)
2) (iii)
3) (iii)
4) (iv)
5) (ii)
6) (i)
7) (iv)
8) (iv)
9) (iv)
10) (i)
11) (ii)
12) (iii)
13) (iii)
14) (ii)
15) (iii)
16) (iv)
17) (iv)
18) (ii)
19) (i)
20) (iv)
21) (ii)
22) (i)
23) (v)
24) (i)
25) (iv)
26) (ii)
27) (iv)
28) (v)
29) (v)
30) (i)
31) (iii)
