EduSahara™ Assignment
Name : Random Samples Metrics
Chapter : Statistics
Grade : ICSE Grade VII
License : Non Commercial Use
Question
1
1.
The scores obtained by 13 students in a test are given below. Find the range.
18
6
8
5
6
3
7
17
3
11
9
4
17
(i)
3
(ii)
8
10
13
(iii)
18
(iv)
15
(v)
7
Question
2
2.
The scores obtained by 6 students in a test are given below. Find the minimum score.
10
20
2
15
13
3
(i)
20
(ii)
2
(iii)
10
1
2
(iv)
18
(v)
11
1
2
Question
3
3.
The scores obtained by 8 students in a test are given below. Find the maximum score.
17
16
1
4
16
20
13
4
(i)
19
(ii)
20
(iii)
4
(iv)
11
3
8
(v)
14
1
2
Question
4
4.
The scores obtained by 7 students in a test are given below. Find the mean score.
19
10
12
18
20
3
10
(i)
17
(ii)
3
(iii)
13
1
7
(iv)
12
(v)
10
Question
5
5.
If the mean of
1
6
7
x
4
2
is
4
5
6
,
find the value of x.
(i)
11
(ii)
10
(iii)
9
(iv)
6
(v)
8
Question
6
6.
Find the mean of all prime numbers between 20 and 90.
(i)
441
8
(ii)
445
8
(iii)
553
10
(iv)
443
8
(v)
111
2
Question
7
7.
Find the mean of first 6 multiples of 12.
(i)
40
(ii)
42
(iii)
45
(iv)
43
(v)
41
Question
8
8.
Find the mean of first 6 whole numbers.
(i)
9
4
(ii)
3
(iii)
5
2
(iv)
7
2
(v)
3
2
Question
9
9.
Find the mean of first 8 multiples of 11.
(i)
50
(ii)
101
2
(iii)
197
4
(iv)
97
2
(v)
99
2
Question
10
10.
Find the mean of the first 10 odd numbers.
(i)
7
(ii)
10
(iii)
9
(iv)
11
(v)
13
Question
11
11.
Find the mean of the first 10 even numbers.
(i)
9
(ii)
10
(iii)
11
(iv)
12
(v)
13
Question
12
12.
The marks obtained by 14 students in a test are given below. Find their mean marks.
49
10
44
26
46
36
40
36
37
46
7
43
28
19
(i)
533
16
(ii)
465
14
(iii)
467
14
(iv)
67
2
(v)
401
12
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 2.
9
50
4
7
41
40
33
24
30
10
27
4
8
19
19
(i)
23
(ii)
73
3
(iii)
117
5
(iv)
25
(v)
71
3
Question
14
14.
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 decreased by 10.
31
18
43
27
21
20
25
22
38
12
46
39
46
30
15
(i)
283
15
(ii)
319
17
(iii)
281
15
(iv)
19
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.
5
15
23
28
45
9
23
41
35
23
(i)
149
3
(ii)
247
5
(iii)
49
(iv)
249
5
(v)
345
7
Question
16
16.
Heights of 10 students (in cm) are given below. Find the mean height.
169
174
158
129
170
171
144
166
137
150
(i)
786
5
cm
(ii)
157
cm
(iii)
784
5
cm
(iv)
794
5
cm
(v)
789
5
cm
Question
17
17.
Heights of 10 plants (in cm) are given below. Find the mean height.
61
64
59
97
65
98
73
53
78
67
(i)
72
cm
(ii)
143
2
cm
(iii)
145
2
cm
(iv)
147
2
cm
Question
18
18.
Ages of 15 students (in years) are given below. Find the mean age.
11
11
10
10
13
13
11
12
10
15
13
12
15
11
11
(i)
208
15
years
(ii)
12
years
(iii)
178
15
years
(iv)
179
15
years
(v)
193
15
years
Question
19
19.
Rainfall of 10 days (in mm) are given below. Find the mean rainfall.
15
13
13
12
6
12
9
13
9
14
(i)
59
5
mm
(ii)
58
5
mm
(iii)
12
mm
(iv)
68
5
mm
(v)
63
5
mm
Question
20
20.
Scores of 11 students are given below. Find the mean score.
89
88
73
90
75
88
74
77
89
74
75
(i)
893
11
(ii)
892
11
(iii)
914
11
(iv)
894
11
(v)
903
11
Question
21
21.
Temperatures of 11 days (in °C) are given below. Find the mean temperature.
26
35
28
28
25
25
31
27
33
26
32
(i)
316
11
°C
(ii)
327
11
°C
(iii)
318
11
°C
(iv)
317
11
°C
(v)
338
11
°C
Question
22
22.
Weights of 11 students (in kg) are given below. Find the mean weight.
58
43
44
57
54
45
42
59
47
40
54
(i)
544
11
kg
(ii)
545
11
kg
(iii)
565
11
kg
(iv)
543
11
kg
(v)
554
11
kg
Question
23
23.
Daily wages of 12 labourers (in ₹) are given below. Find the mean wage.
318
428
305
496
370
320
376
484
490
426
364
479
(i)
₹
405.00
(ii)
₹
405.67
(iii)
₹
405.33
(iv)
₹
406.67
(v)
₹
404.67
Question
24
24.
The mean of the below random sample is
25
7
10
.
Find the missing quantity.
14
41
39
12
47
41
25
x
12
10
(i)
16
(ii)
14
(iii)
15
(iv)
19
(v)
17
Question
25
25.
Given the mean of
11
samples as
6
,
what is the mean if a sample value is
increased
by
13
?
(i)
81
11
(ii)
65
9
(iii)
93
13
(iv)
7
(v)
79
11
Question
26
26.
Given the mean of
9
samples as
9
,
what is the mean if a sample value is
decreased
by
13
?
(i)
82
11
(ii)
68
9
(iii)
70
9
(iv)
22
3
(v)
54
7
Question
27
27.
Given the mean of
10
samples as
5
1
2
,
what is the new mean if two samples
3
and
8
are added ?
(i)
11
2
(ii)
6
(iii)
21
4
(iv)
13
2
(v)
9
2
Question
28
28.
Given the mean of
12
samples as
4
2
3
,
what is the new mean if two samples
5
and
2
are removed ?
(i)
19
4
(ii)
49
10
(iii)
41
8
(iv)
47
10
(v)
51
10
Question
29
29.
Find the mean of all prime numbers between 30 and 60.
(i)
309
7
(ii)
223
5
(iii)
133
3
(iv)
313
7
(v)
311
7
Question
30
30.
Find the mean of all prime numbers between 10 and 70.
(i)
183
5
(ii)
553
15
(iii)
479
13
(iv)
551
15
(v)
623
17
Question
31
31.
Heights of 15 plants (in cm) are given below. Find the mean height.
97
96
67
61
57
98
66
63
61
93
71
65
89
56
67
(i)
74
cm
(ii)
371
5
cm
(iii)
374
5
cm
(iv)
379
5
cm
(v)
369
5
cm
Assignment Key
1) (iv)
2) (ii)
3) (ii)
4) (iii)
5) (iii)
6) (iv)
7) (ii)
8) (iii)
9) (v)
10) (ii)
11) (iii)
12) (iii)
13) (v)
14) (i)
15) (ii)
16) (iii)
17) (ii)
18) (iii)
19) (ii)
20) (ii)
21) (i)
22) (iv)
23) (v)
24) (i)
25) (v)
26) (ii)
27) (i)
28) (ii)
29) (v)
30) (iv)
31) (v)
