EduSahara™ Assignment
Name : Random Samples Metrics
Chapter : Statistics
Grade : ICSE Grade VII
License : Non Commercial Use
Question
1
1.
The scores obtained by 9 students in a test are given below. Find the range.
19
6
1
15
1
13
16
20
2
(i)
1
(ii)
10
1
3
(iii)
13
(iv)
19
(v)
20
Question
2
2.
The scores obtained by 9 students in a test are given below. Find the minimum score.
5
3
13
6
15
11
18
4
17
(i)
10
2
9
(ii)
15
(iii)
3
(iv)
18
(v)
11
Question
3
3.
The scores obtained by 9 students in a test are given below. Find the maximum score.
4
1
15
10
14
15
7
17
8
(i)
16
(ii)
10
(iii)
15
(iv)
1
(v)
17
Question
4
4.
The scores obtained by 12 students in a test are given below. Find the mean score.
15
20
6
4
6
9
19
7
11
11
6
7
(i)
10
1
12
(ii)
16
(iii)
8
(iv)
4
(v)
20
Question
5
5.
If the mean of
10
8
5
6
x
2
9
1
is
5
5
8
,
find the value of x.
(i)
1
(ii)
4
(iii)
6
(iv)
5
(v)
3
Question
6
6.
Find the mean of all prime numbers between 20 and 90.
(i)
553
10
(ii)
445
8
(iii)
111
2
(iv)
443
8
(v)
441
8
Question
7
7.
Find the mean of first 6 multiples of 14.
(i)
46
(ii)
51
(iii)
49
(iv)
50
(v)
48
Question
8
8.
Find the mean of first 5 whole numbers.
(i)
3
(ii)
5
(iii)
0
(iv)
1
(v)
2
Question
9
9.
Find the mean of first 10 multiples of 15.
(i)
167
2
(ii)
163
2
(iii)
83
(iv)
329
4
(v)
165
2
Question
10
10.
Find the mean of the first 20 odd numbers.
(i)
18
(ii)
21
(iii)
22
(iv)
20
(v)
19
Question
11
11.
Find the mean of the first 15 even numbers.
(i)
14
(ii)
18
(iii)
17
(iv)
16
(v)
15
Question
12
12.
The marks obtained by 13 students in a test are given below. Find their mean marks.
27
21
16
20
30
17
44
23
23
16
1
8
31
(i)
277
13
(ii)
275
13
(iii)
319
15
(iv)
279
13
(v)
235
11
Question
13
13.
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 increased by 8.
48
25
25
33
43
15
50
3
30
42
21
(i)
347
9
(ii)
499
13
(iii)
423
11
(iv)
425
11
(v)
421
11
Question
14
14.
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 decreased by 6.
12
13
26
49
19
23
41
42
38
23
40
(i)
262
11
(ii)
306
13
(iii)
260
11
(iv)
258
11
(v)
214
9
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.
47
19
22
32
50
32
5
41
22
22
34
(i)
650
11
(ii)
654
11
(iii)
178
3
(iv)
770
13
(v)
652
11
Question
16
16.
Heights of 12 students (in cm) are given below. Find the mean height.
169
168
158
157
125
174
161
142
132
152
136
158
(i)
458
3
cm
(ii)
460
3
cm
(iii)
153
cm
(iv)
464
3
cm
(v)
461
3
cm
Question
17
17.
Heights of 14 plants (in cm) are given below. Find the mean height.
65
90
73
74
75
77
65
83
97
59
97
93
50
53
(i)
526
7
cm
(ii)
1079
14
cm
(iii)
1051
14
cm
(iv)
1065
14
cm
(v)
1053
14
cm
Question
18
18.
Ages of 14 students (in years) are given below. Find the mean age.
14
13
11
11
12
14
13
14
14
11
10
13
10
13
(i)
201
14
years
(ii)
173
14
years
(iii)
87
7
years
(iv)
25
2
years
(v)
187
14
years
Question
19
19.
Rainfall of 10 days (in mm) are given below. Find the mean rainfall.
8
14
12
10
10
7
13
10
10
9
(i)
103
10
mm
(ii)
21
2
mm
(iii)
123
10
mm
(iv)
52
5
mm
(v)
113
10
mm
Question
20
20.
Scores of 13 students are given below. Find the mean score.
90
84
88
77
81
78
79
83
79
84
84
78
70
(i)
1055
13
(ii)
1068
13
(iii)
1081
13
(iv)
1057
13
(v)
1056
13
Question
21
21.
Temperatures of 10 days (in °C) are given below. Find the mean temperature.
30
27
28
32
29
25
26
34
26
26
(i)
142
5
°C
(ii)
57
2
°C
(iii)
303
10
°C
(iv)
293
10
°C
(v)
283
10
°C
Question
22
22.
Weights of 11 students (in kg) are given below. Find the mean weight.
49
41
41
56
46
53
43
53
48
49
40
(i)
520
11
kg
(ii)
521
11
kg
(iii)
519
11
kg
(iv)
541
11
kg
(v)
530
11
kg
Question
23
23.
Daily wages of 12 labourers (in ₹) are given below. Find the mean wage.
398
491
383
419
377
497
428
464
328
375
377
496
(i)
₹
419.42
(ii)
₹
419.58
(iii)
₹
419.50
(iv)
₹
421.42
(v)
₹
420.42
Question
24
24.
The mean of the below random sample is
26
1
2
.
Find the missing quantity.
35
13
12
46
24
10
35
x
45
31
(i)
13
(ii)
14
(iii)
11
(iv)
17
(v)
15
Question
25
25.
Given the mean of
15
samples as
9
7
15
,
what is the mean if a sample value is
increased
by
16
?
(i)
138
13
(ii)
158
15
(iii)
32
3
(iv)
178
17
(v)
52
5
Question
26
26.
Given the mean of
11
samples as
10
6
11
,
what is the mean if a sample value is
decreased
by
16
?
(i)
82
9
(ii)
118
13
(iii)
98
11
(iv)
100
11
(v)
102
11
Question
27
27.
Given the mean of
10
samples as
4
9
10
,
what is the new mean if two samples
4
and
5
are added ?
(i)
21
4
(ii)
9
2
(iii)
31
6
(iv)
37
8
(v)
29
6
Question
28
28.
Given the mean of
12
samples as
6
7
12
,
what is the new mean if two samples
9
and
9
are removed ?
(i)
49
8
(ii)
61
10
(iii)
73
12
(iv)
59
10
(v)
63
10
Question
29
29.
Find the mean of all prime numbers between 30 and 70.
(i)
437
9
(ii)
535
11
(iii)
439
9
(iv)
49
Question
30
30.
Find the mean of all prime numbers between 40 and 90.
(i)
257
4
(ii)
127
2
(iii)
509
8
(iv)
383
6
(v)
385
6
Question
31
31.
Heights of 15 plants (in cm) are given below. Find the mean height.
88
89
90
55
81
91
60
73
97
75
67
79
70
79
58
(i)
394
5
cm
(ii)
386
5
cm
(iii)
389
5
cm
(iv)
384
5
cm
(v)
77
cm
Assignment Key
1) (iv)
2) (iii)
3) (v)
4) (i)
5) (ii)
6) (iv)
7) (iii)
8) (v)
9) (v)
10) (iv)
11) (iv)
12) (i)
13) (iii)
14) (iii)
15) (v)
16) (i)
17) (iii)
18) (ii)
19) (i)
20) (i)
21) (v)
22) (iii)
23) (i)
24) (ii)
25) (ii)
26) (iv)
27) (v)
28) (ii)
29) (iii)
30) (iv)
31) (iv)
