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.
16
17
5
5
11
12
16
13
4
11
(i)
5
(ii)
11
1
2
(iii)
17
(iv)
4
(v)
13
Question
2
2.
The scores obtained by 13 students in a test are given below. Find the minimum score.
2
4
1
16
13
20
7
20
1
18
8
14
2
(i)
9
9
13
(ii)
1
(iii)
8
(iv)
19
(v)
20
Question
3
3.
The scores obtained by 7 students in a test are given below. Find the maximum score.
18
18
4
8
15
12
9
(i)
12
(ii)
18
(iii)
4
(iv)
14
(v)
0
Question
4
4.
The scores obtained by 11 students in a test are given below. Find the mean score.
2
3
1
18
19
13
5
13
18
2
2
(i)
19
(ii)
8
8
11
(iii)
5
(iv)
2
(v)
18
Question
5
5.
If the mean of
2
1
5
x
7
10
4
is
5
,
find the value of x.
(i)
5
(ii)
3
(iii)
8
(iv)
7
(v)
6
Question
6
6.
Find the mean of all prime numbers between 40 and 60.
(i)
241
5
(ii)
49
(iii)
339
7
(iv)
243
5
Question
7
7.
Find the mean of first 10 multiples of 10.
(i)
55
(ii)
57
(iii)
54
(iv)
53
(v)
56
Question
8
8.
Find the mean of first 5 whole numbers.
(i)
3
(ii)
5
(iii)
2
(iv)
-1
(v)
1
Question
9
9.
Find the mean of first 7 multiples of 6.
(i)
27
(ii)
22
(iii)
23
(iv)
24
(v)
25
Question
10
10.
Find the mean of the first 10 odd numbers.
(i)
11
(ii)
12
(iii)
7
(iv)
10
(v)
9
Question
11
11.
Find the mean of the first 10 even numbers.
(i)
12
(ii)
10
(iii)
13
(iv)
11
(v)
8
Question
12
12.
The marks obtained by 15 students in a test are given below. Find their mean marks.
46
47
3
21
6
28
24
5
37
13
48
35
40
6
38
(i)
345
13
(ii)
449
17
(iii)
397
15
(iv)
79
3
(v)
133
5
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 8.
7
14
27
32
22
11
9
3
5
32
40
31
39
(i)
144
5
(ii)
376
13
(iii)
374
13
(iv)
378
13
(v)
320
11
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 9.
38
3
45
15
30
3
26
49
22
24
(i)
33
2
(ii)
17
(iii)
35
2
(iv)
65
4
(v)
31
2
Question
15
15.
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 doubled.
15
13
26
2
38
22
4
6
11
8
(i)
32
(ii)
28
(iii)
26
(iv)
29
(v)
30
Question
16
16.
Heights of 10 students (in cm) are given below. Find the mean height.
156
131
150
125
164
126
150
139
127
161
(i)
143
cm
(ii)
1449
10
cm
(iii)
1431
10
cm
(iv)
1429
10
cm
(v)
1439
10
cm
Question
17
17.
Heights of 15 plants (in cm) are given below. Find the mean height.
69
80
81
84
67
69
78
95
70
81
81
93
76
72
90
(i)
1216
15
cm
(ii)
1201
15
cm
(iii)
1187
15
cm
(iv)
396
5
cm
(v)
1186
15
cm
Question
18
18.
Ages of 15 students (in years) are given below. Find the mean age.
11
10
11
15
10
12
10
13
11
15
11
11
13
13
15
(i)
181
15
years
(ii)
211
15
years
(iii)
196
15
years
(iv)
61
5
years
(v)
182
15
years
Question
19
19.
Rainfall of 13 days (in mm) are given below. Find the mean rainfall.
9
7
9
10
10
15
7
13
8
5
7
8
7
(i)
116
13
mm
(ii)
141
13
mm
(iii)
128
13
mm
(iv)
9
mm
(v)
115
13
mm
Question
20
20.
Scores of 13 students are given below. Find the mean score.
81
73
76
78
77
87
85
78
82
74
83
81
78
(i)
1046
13
(ii)
1059
13
(iii)
1035
13
(iv)
1034
13
(v)
1033
13
Question
21
21.
Temperatures of 11 days (in °C) are given below. Find the mean temperature.
29
34
26
28
35
27
31
29
34
33
35
(i)
33
°C
(ii)
29
°C
(iii)
30
°C
(iv)
32
°C
(v)
31
°C
Question
22
22.
Weights of 11 students (in kg) are given below. Find the mean weight.
59
45
51
55
41
51
40
45
41
51
55
(i)
536
11
kg
(ii)
545
11
kg
(iii)
534
11
kg
(iv)
556
11
kg
(v)
535
11
kg
Question
23
23.
Daily wages of 11 labourers (in ₹) are given below. Find the mean wage.
426
384
466
486
367
434
439
386
464
441
397
(i)
₹
426.45
(ii)
₹
426.55
(iii)
₹
428.36
(iv)
₹
426.36
(v)
₹
427.36
Question
24
24.
The mean of the below random sample is
31
.
Find the missing quantity.
24
35
34
x
17
47
46
34
19
33
(i)
23
(ii)
18
(iii)
21
(iv)
20
(v)
22
Question
25
25.
Given the mean of
14
samples as
9
2
7
,
what is the mean if a sample value is
increased
by
10
?
(i)
9
(ii)
7
(iii)
11
(iv)
12
(v)
10
Question
26
26.
Given the mean of
8
samples as
13
1
4
,
what is the mean if a sample value is
decreased
by
15
?
(i)
91
8
(ii)
93
8
(iii)
89
8
(iv)
23
2
(v)
113
10
Question
27
27.
Given the mean of
10
samples as
5
9
10
,
what is the new mean if two samples
10
and
10
are added ?
(i)
77
12
(ii)
27
4
(iii)
13
2
(iv)
67
10
(v)
79
12
Question
28
28.
Given the mean of
12
samples as
4
5
6
,
what is the new mean if two samples
8
and
2
are removed ?
(i)
24
5
(ii)
16
3
(iii)
22
5
(iv)
26
5
(v)
32
7
Question
29
29.
Find the mean of all prime numbers between 20 and 70.
(i)
493
11
(ii)
403
9
(iii)
491
11
(iv)
489
11
(v)
579
13
Question
30
30.
Find the mean of all prime numbers between 30 and 100.
(i)
807
13
(ii)
1055
17
(iii)
931
15
(iv)
311
5
(v)
929
15
Question
31
31.
Heights of 12 plants (in cm) are given below. Find the mean height.
70
100
82
82
88
63
65
64
96
58
73
84
(i)
463
6
cm
(ii)
925
12
cm
(iii)
949
12
cm
(iv)
937
12
cm
(v)
309
4
cm
Assignment Key
1) (v)
2) (ii)
3) (ii)
4) (ii)
5) (v)
6) (iv)
7) (i)
8) (iii)
9) (iv)
10) (iv)
11) (iv)
12) (iii)
13) (ii)
14) (i)
15) (iv)
16) (iv)
17) (v)
18) (i)
19) (v)
20) (v)
21) (v)
22) (iii)
23) (iv)
24) (iii)
25) (v)
26) (i)
27) (v)
28) (i)
29) (iii)
30) (iii)
31) (ii)
