EduSahara™ Assignment
Name : Mean of Raw Data
Chapter : Statistics
Grade : ICSE Grade VIII
License : Non Commercial Use
Question
1
1.
The scores obtained by 6 students in a test are given below. Find the mean score.
14
2
18
6
5
3
(i)
18
(ii)
5
1
2
(iii)
2
(iv)
8
(v)
16
Question
2
2.
If the mean of
3
5
4
x
6
8
is
4
2
3
,
find the value of x.
(i)
2
(ii)
3
(iii)
-1
(iv)
1
(v)
5
Question
3
3.
The mean of the below random sample is
24
7
10
.
Find the missing quantity.
x
47
16
15
12
21
46
15
25
31
(i)
16
(ii)
18
(iii)
19
(iv)
22
(v)
20
Question
4
4.
Given the mean of
10
samples as
9
,
what is the mean if a sample value is
increased
by
15
?
(i)
41
4
(ii)
23
2
(iii)
21
2
(iv)
19
2
(v)
11
Question
5
5.
Given the mean of
15
samples as
9
2
15
,
what is the mean if a sample value is
decreased
by
13
?
(i)
122
15
(ii)
140
17
(iii)
124
15
(iv)
42
5
(v)
108
13
Question
6
6.
Given the mean of
10
samples as
4
4
5
,
what is the new mean if two samples
2
and
10
are added ?
(i)
6
(ii)
5
(iii)
2
(iv)
4
(v)
7
Question
7
7.
Given the mean of
12
samples as
7
1
3
,
what is the new mean if two samples
9
and
9
are removed ?
(i)
6
(ii)
4
(iii)
7
(iv)
8
(v)
9
Question
8
8.
Find the mean of all prime numbers between 20 and 60.
(i)
121
3
(ii)
119
3
(iii)
41
(iv)
201
5
Question
9
9.
Find the mean of all prime numbers between 20 and 90.
(i)
553
10
(ii)
111
2
(iii)
441
8
(iv)
443
8
(v)
445
8
Question
10
10.
Find the mean of first 6 multiples of 19.
(i)
67
(ii)
133
2
(iii)
131
2
(iv)
265
4
(v)
135
2
Question
11
11.
Find the mean of first 7 whole numbers.
(i)
2
(ii)
5
(iii)
3
(iv)
0
(v)
4
Question
12
12.
Find the mean of first 8 multiples of 16.
(i)
74
(ii)
72
(iii)
73
(iv)
69
(v)
71
Question
13
13.
Find the mean of the first 15 odd numbers.
(i)
13
(ii)
15
(iii)
18
(iv)
14
(v)
16
Question
14
14.
Find the mean of the first 20 even numbers.
(i)
22
(ii)
23
(iii)
20
(iv)
18
(v)
21
Question
15
15.
The marks obtained by 14 students in a test are given below. Find their mean marks.
42
11
1
40
26
43
47
17
3
20
10
27
49
42
(i)
24
(ii)
27
(iii)
30
(iv)
26
(v)
28
Question
16
16.
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 increased by 5.
41
48
6
48
42
48
5
17
46
32
(i)
153
4
(ii)
307
8
(iii)
381
10
(iv)
383
10
(v)
77
2
Question
17
17.
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 5.
40
37
18
47
3
18
25
32
35
26
43
27
49
30
32
(i)
129
5
(ii)
179
7
(iii)
127
5
(iv)
131
5
(v)
79
3
Question
18
18.
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 doubled.
46
32
23
33
43
40
14
12
16
1
22
48
37
42
32
(i)
294
5
(ii)
178
3
(iii)
296
5
(iv)
292
5
(v)
410
7
Question
19
19.
Heights of 15 students (in cm) are given below. Find the mean height.
140
128
148
148
163
164
135
171
166
165
145
142
171
133
160
(i)
152
cm
(ii)
2279
15
cm
(iii)
2309
15
cm
(iv)
2281
15
cm
(v)
2294
15
cm
Question
20
20.
Heights of 11 plants (in cm) are given below. Find the mean height.
51
61
80
73
58
92
52
77
54
52
99
(i)
760
11
cm
(ii)
750
11
cm
(iii)
771
11
cm
(iv)
751
11
cm
(v)
749
11
cm
Question
21
21.
Ages of 10 students (in years) are given below. Find the mean age.
13
14
13
10
12
10
13
13
10
15
(i)
123
10
years
(ii)
133
10
years
(iii)
25
2
years
(iv)
143
10
years
(v)
62
5
years
Question
22
22.
Rainfall of 14 days (in mm) are given below. Find the mean rainfall.
6
11
5
5
7
7
13
6
9
9
10
11
7
8
(i)
58
7
mm
(ii)
59
7
mm
(iii)
64
7
mm
(iv)
57
7
mm
(v)
71
7
mm
Question
23
23.
Scores of 14 students are given below. Find the mean score.
70
86
85
87
81
73
87
89
89
89
71
71
89
75
(i)
571
7
(ii)
585
7
(iii)
578
7
(iv)
572
7
(v)
573
7
Question
24
24.
Temperatures of 15 days (in °C) are given below. Find the mean temperature.
29
25
34
26
25
29
30
28
29
35
35
26
26
35
35
(i)
30
°C
(ii)
159
5
°C
(iii)
149
5
°C
(iv)
151
5
°C
(v)
154
5
°C
Question
25
25.
Weights of 14 students (in kg) are given below. Find the mean weight.
56
48
50
52
54
55
59
53
56
42
60
53
56
43
(i)
737
14
kg
(ii)
739
14
kg
(iii)
751
14
kg
(iv)
369
7
kg
(v)
765
14
kg
Question
26
26.
Daily wages of 10 labourers (in ₹) are given below. Find the mean wage.
344
409
319
444
495
469
372
500
379
343
(i)
₹
407.40
(ii)
₹
407.80
(iii)
₹
409.40
(iv)
₹
407.60
(v)
₹
408.40
Question
27
27.
The arithmetic mean of
33
45
3
13
36
is
(i)
28
(ii)
24
(iii)
25
(iv)
26
(v)
27
Question
28
28.
The arithmetic mean of a + 2, a, and a - 2 is
(i)
a + 2
(ii)
3a
(iii)
a - 2
(iv)
a
Question
29
29.
If the mean of
4
samples is
21
1
4
,
what is the new mean if
6
is added to each number.
(i)
109
4
(ii)
163
6
(iii)
107
4
(iv)
55
2
(v)
111
4
Question
30
30.
If the mean of
7
samples is
20
6
7
,
what is the new mean if
5
is subtracted from each number.
(i)
113
7
(ii)
111
7
(iii)
109
7
(iv)
81
5
(v)
47
3
Question
31
31.
If the mean of
8
samples is
20
5
8
,
what is the new mean if each number is multiplied by
3
.
(i)
497
8
(ii)
373
6
(iii)
493
8
(iv)
617
10
(v)
495
8
Question
32
32.
The mean of
8
numbers is
12
.
Upon
excluding
one number,
the mean becomes
12
4
7
.
Find the
excluded
number.
(i)
7
(ii)
8
(iii)
5
(iv)
11
(v)
9
Question
33
33.
The mean of
9
numbers is
7
7
9
.
Upon
adding
one number,
the mean becomes
8
3
10
.
Find the
included
number.
(i)
12
(ii)
16
(iii)
10
(iv)
14
(v)
13
Assignment Key
1) (iv)
2) (i)
3) (iii)
4) (iii)
5) (iii)
6) (ii)
7) (iii)
8) (i)
9) (iv)
10) (ii)
11) (iii)
12) (ii)
13) (ii)
14) (v)
15) (ii)
16) (iv)
17) (i)
18) (i)
19) (ii)
20) (v)
21) (i)
22) (iv)
23) (i)
24) (iii)
25) (i)
26) (i)
27) (iv)
28) (iv)
29) (i)
30) (ii)
31) (v)
32) (ii)
33) (v)
