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.
6
7
3
3
16
17
5
11
19
18
4
9
13
(i)
3
(ii)
16
(iii)
10
1
13
(iv)
19
(v)
9
Question
2
2.
The scores obtained by 9 students in a test are given below. Find the minimum score.
2
15
17
6
2
20
10
20
7
(i)
18
(ii)
2
(iii)
10
(iv)
20
(v)
11
Question
3
3.
The scores obtained by 12 students in a test are given below. Find the maximum score.
2
6
4
18
16
16
12
15
19
5
18
15
(i)
15
(ii)
19
(iii)
2
(iv)
12
1
6
(v)
17
Question
4
4.
The scores obtained by 12 students in a test are given below. Find the mean score.
18
15
13
17
2
11
5
15
20
10
9
11
(i)
11
(ii)
18
(iii)
12
1
6
(iv)
20
(v)
12
Question
5
5.
If the mean of
1
5
x
9
10
is
5
2
5
,
find the value of x.
(i)
3
(ii)
4
(iii)
2
(iv)
-1
(v)
1
Question
6
6.
Find the mean of all prime numbers between 40 and 60.
(i)
49
(ii)
339
7
(iii)
241
5
(iv)
243
5
Question
7
7.
Find the mean of first 5 multiples of 18.
(i)
53
(ii)
55
(iii)
52
(iv)
57
(v)
54
Question
8
8.
Find the mean of first 8 whole numbers.
(i)
4
(ii)
9
2
(iii)
13
4
(iv)
7
2
(v)
5
2
Question
9
9.
Find the mean of first 7 multiples of 11.
(i)
45
(ii)
47
(iii)
43
(iv)
42
(v)
44
Question
10
10.
Find the mean of the first 20 odd numbers.
(i)
19
(ii)
18
(iii)
22
(iv)
20
(v)
21
Question
11
11.
Find the mean of the first 20 even numbers.
(i)
24
(ii)
22
(iii)
18
(iv)
20
(v)
21
Question
12
12.
The marks obtained by 14 students in a test are given below. Find their mean marks.
12
22
13
43
12
30
3
3
43
9
31
47
24
32
(i)
116
5
(ii)
160
7
(iii)
164
7
(iv)
208
9
(v)
162
7
Question
13
13.
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 increased by 1.
47
32
48
12
1
45
16
24
40
19
7
48
37
35
(i)
425
14
(ii)
485
16
(iii)
365
12
(iv)
61
2
(v)
423
14
Question
14
14.
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 decreased by 1.
8
36
3
35
18
50
14
21
20
3
45
42
4
(i)
21
(ii)
25
(iii)
19
(iv)
23
(v)
22
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.
36
45
39
17
15
13
47
47
7
29
(i)
62
(ii)
60
(iii)
58
(iv)
56
(v)
59
Question
16
16.
Heights of 11 students (in cm) are given below. Find the mean height.
148
145
130
131
143
166
157
154
149
146
139
(i)
1619
11
cm
(ii)
1609
11
cm
(iii)
1608
11
cm
(iv)
1610
11
cm
(v)
1630
11
cm
Question
17
17.
Heights of 14 plants (in cm) are given below. Find the mean height.
94
60
75
86
50
54
91
52
85
87
88
59
100
53
(i)
519
7
cm
(ii)
517
7
cm
(iii)
74
cm
(iv)
524
7
cm
(v)
531
7
cm
Question
18
18.
Ages of 14 students (in years) are given below. Find the mean age.
10
14
11
11
13
10
10
15
12
11
14
13
11
13
(i)
11
years
(ii)
14
years
(iii)
12
years
(iv)
13
years
(v)
10
years
Question
19
19.
Rainfall of 14 days (in mm) are given below. Find the mean rainfall.
13
7
10
8
6
14
14
13
11
6
15
6
10
7
(i)
8
mm
(ii)
9
mm
(iii)
10
mm
(iv)
11
mm
(v)
12
mm
Question
20
20.
Scores of 11 students are given below. Find the mean score.
71
77
90
80
70
83
82
83
75
89
73
(i)
875
11
(ii)
873
11
(iii)
895
11
(iv)
874
11
(v)
884
11
Question
21
21.
Temperatures of 13 days (in °C) are given below. Find the mean temperature.
30
25
34
27
35
31
33
26
28
32
25
30
30
(i)
386
13
°C
(ii)
399
13
°C
(iii)
387
13
°C
(iv)
388
13
°C
(v)
412
13
°C
Question
22
22.
Weights of 14 students (in kg) are given below. Find the mean weight.
40
47
56
58
45
53
58
49
57
40
40
48
47
50
(i)
345
7
kg
(ii)
346
7
kg
(iii)
351
7
kg
(iv)
358
7
kg
(v)
344
7
kg
Question
23
23.
Daily wages of 14 labourers (in ₹) are given below. Find the mean wage.
484
446
343
424
438
382
454
328
323
327
466
387
338
391
(i)
₹
396.07
(ii)
₹
395.14
(iii)
₹
397.07
(iv)
₹
395.21
(v)
₹
395.07
Question
24
24.
The mean of the below random sample is
35
7
10
.
Find the missing quantity.
43
39
48
30
42
27
29
42
29
x
(i)
28
(ii)
29
(iii)
31
(iv)
27
(v)
25
Question
25
25.
Given the mean of
14
samples as
8
4
7
,
what is the mean if a sample value is
increased
by
17
?
(i)
155
16
(ii)
137
14
(iii)
119
12
(iv)
135
14
(v)
139
14
Question
26
26.
Given the mean of
6
samples as
8
1
3
,
what is the mean if a sample value is
decreased
by
13
?
(i)
37
6
(ii)
35
6
(iii)
25
4
(iv)
13
2
(v)
49
8
Question
27
27.
Given the mean of
10
samples as
4
7
10
,
what is the new mean if two samples
4
and
4
are added ?
(i)
55
12
(ii)
47
10
(iii)
9
2
(iv)
19
4
(v)
53
12
Question
28
28.
Given the mean of
12
samples as
4
11
12
,
what is the new mean if two samples
1
and
10
are removed ?
(i)
16
3
(ii)
22
5
(iii)
32
7
(iv)
24
5
(v)
26
5
Question
29
29.
Find the mean of all prime numbers between 40 and 90.
(i)
383
6
(ii)
127
2
(iii)
385
6
(iv)
509
8
(v)
257
4
Question
30
30.
Find the mean of all prime numbers between 40 and 100.
(i)
863
13
(ii)
865
13
(iii)
861
13
(iv)
731
11
(v)
199
3
Question
31
31.
Heights of 13 plants (in cm) are given below. Find the mean height.
50
87
96
87
71
94
63
85
76
61
75
86
79
(i)
1010
13
cm
(ii)
1012
13
cm
(iii)
1023
13
cm
(iv)
1011
13
cm
(v)
1036
13
cm
Assignment Key
1) (ii)
2) (ii)
3) (ii)
4) (iii)
5) (iii)
6) (iv)
7) (v)
8) (iv)
9) (v)
10) (iv)
11) (v)
12) (v)
13) (i)
14) (v)
15) (v)
16) (iii)
17) (ii)
18) (iii)
19) (iii)
20) (ii)
21) (i)
22) (v)
23) (v)
24) (i)
25) (ii)
26) (i)
27) (i)
28) (iv)
29) (i)
30) (i)
31) (i)
