EduSahara™ Assignment
Name : Mean of Raw Data
Chapter : Statistics
Grade : CBSE Grade IX
License : Non Commercial Use
Question
1
1.
If the mean of
4
5
2
x
3
7
1
is
4
,
find the value of x.
(i)
8
(ii)
7
(iii)
5
(iv)
4
(v)
6
Question
2
2.
The mean of the below random sample is
28
4
5
.
Find the missing quantity.
26
16
27
20
x
26
36
39
33
29
(i)
36
(ii)
35
(iii)
39
(iv)
37
(v)
34
Question
3
3.
Given the mean of
7
samples as
10
5
7
,
what is the mean if a sample value is
increased
by
17
?
(i)
92
7
(ii)
118
9
(iii)
90
7
(iv)
94
7
(v)
66
5
Question
4
4.
Given the mean of
12
samples as
10
1
6
,
what is the mean if a sample value is
decreased
by
11
?
(i)
19
2
(ii)
35
4
(iii)
37
4
(iv)
39
4
(v)
55
6
Question
5
5.
Given the mean of
10
samples as
7
7
10
,
what is the new mean if two samples
2
and
6
are added ?
(i)
85
12
(ii)
99
14
(iii)
29
4
(iv)
71
10
(v)
83
12
Question
6
6.
Given the mean of
12
samples as
6
1
4
,
what is the new mean if two samples
5
and
10
are removed ?
(i)
3
(ii)
6
(iii)
7
(iv)
5
(v)
9
Question
7
7.
Find the mean of all prime numbers between 20 and 70.
(i)
403
9
(ii)
491
11
(iii)
489
11
(iv)
493
11
(v)
579
13
Question
8
8.
Find the mean of all prime numbers between 10 and 80.
(i)
45
(ii)
40
(iii)
44
(iv)
43
(v)
42
Question
9
9.
Find the mean of first 7 multiples of 15.
(i)
63
(ii)
60
(iii)
61
(iv)
57
(v)
59
Question
10
10.
Find the mean of first 8 whole numbers.
(i)
7
2
(ii)
13
4
(iii)
5
2
(iv)
9
2
(v)
4
Question
11
11.
Find the mean of first 10 multiples of 18.
(i)
99
(ii)
98
(iii)
102
(iv)
100
(v)
96
Question
12
12.
Find the mean of the first 10 odd numbers.
(i)
11
(ii)
10
(iii)
7
(iv)
9
(v)
13
Question
13
13.
Find the mean of the first 10 even numbers.
(i)
11
(ii)
12
(iii)
9
(iv)
10
(v)
13
Question
14
14.
The marks obtained by 15 students in a test are given below. Find their mean marks.
41
10
18
34
42
22
36
31
37
47
46
36
11
31
29
(i)
159
5
(ii)
95
3
(iii)
157
5
(iv)
31
(v)
219
7
Question
15
15.
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 7.
9
13
30
12
22
40
26
39
41
31
37
21
23
(i)
435
13
(ii)
433
13
(iii)
369
11
(iv)
437
13
(v)
167
5
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 decreased by 6.
4
41
38
49
48
22
10
48
49
48
(i)
355
12
(ii)
299
10
(iii)
239
8
(iv)
297
10
(v)
59
2
Question
17
17.
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.
1
3
8
44
35
42
8
36
31
50
(i)
256
5
(ii)
258
5
(iii)
52
(iv)
360
7
Question
18
18.
Heights of 13 students (in cm) are given below. Find the mean height.
161
144
145
144
174
147
127
159
158
125
127
142
132
(i)
147
cm
(ii)
143
cm
(iii)
144
cm
(iv)
146
cm
(v)
145
cm
Question
19
19.
Heights of 12 plants (in cm) are given below. Find the mean height.
62
73
55
52
97
54
73
87
59
73
89
86
(i)
215
3
cm
(ii)
72
cm
(iii)
221
3
cm
(iv)
217
3
cm
(v)
218
3
cm
Question
20
20.
Ages of 15 students (in years) are given below. Find the mean age.
13
13
12
14
15
10
12
11
12
11
12
12
11
13
15
(i)
72
5
years
(ii)
64
5
years
(iii)
62
5
years
(iv)
67
5
years
(v)
63
5
years
Question
21
21.
Rainfall of 14 days (in mm) are given below. Find the mean rainfall.
10
7
9
9
10
5
9
10
11
13
6
15
10
7
(i)
19
2
mm
(ii)
145
14
mm
(iii)
131
14
mm
(iv)
66
7
mm
(v)
159
14
mm
Question
22
22.
Scores of 13 students are given below. Find the mean score.
77
86
77
89
78
82
85
90
71
75
86
90
86
(i)
1085
13
(ii)
1073
13
(iii)
1098
13
(iv)
1072
13
(v)
1074
13
Question
23
23.
Temperatures of 15 days (in °C) are given below. Find the mean temperature.
27
35
33
31
30
30
35
25
34
34
30
27
35
27
26
(i)
153
5
°C
(ii)
31
°C
(iii)
158
5
°C
(iv)
154
5
°C
(v)
163
5
°C
Question
24
24.
Weights of 12 students (in kg) are given below. Find the mean weight.
42
49
41
48
56
49
41
56
57
57
57
58
(i)
623
12
kg
(ii)
611
12
kg
(iii)
635
12
kg
(iv)
613
12
kg
(v)
51
kg
Question
25
25.
Daily wages of 15 labourers (in ₹) are given below. Find the mean wage.
427
399
467
482
344
358
371
449
468
389
441
466
363
472
478
(i)
₹
425.93
(ii)
₹
426.93
(iii)
₹
425.07
(iv)
₹
425.00
(v)
₹
424.93
Question
26
26.
The arithmetic mean of a + 2, a, and a - 2 is
(i)
a
(ii)
a - 2
(iii)
a + 2
(iv)
3a
Question
27
27.
If the mean of
5
samples is
26
2
5
,
what is the new mean if
6
is added to each number.
(i)
164
5
(ii)
226
7
(iii)
32
(iv)
98
3
(v)
162
5
Question
28
28.
If the mean of
5
samples is
29
1
5
,
what is the new mean if
6
is subtracted from each number.
(i)
118
5
(ii)
114
5
(iii)
116
5
(iv)
70
3
(v)
162
7
Question
29
29.
If the mean of
6
samples is
22
1
2
,
what is the new mean if each number is multiplied by
6
.
(i)
136
(ii)
137
(iii)
132
(iv)
135
(v)
134
Question
30
30.
The mean of
5
numbers is
11
2
5
.
Upon
excluding
one number,
the mean becomes
9
3
4
.
Find the
excluded
number.
(i)
20
(ii)
18
(iii)
15
(iv)
17
(v)
19
Question
31
31.
The mean of
9
numbers is
8
2
3
.
Upon
adding
one number,
the mean becomes
8
2
5
.
Find the
included
number.
(i)
5
(ii)
4
(iii)
8
(iv)
6
(v)
7
Question
32
32.
The scores obtained by 7 students in a test are given below. Find the mean score.
4
3
14
5
4
4
20
(i)
20
(ii)
7
5
7
(iii)
3
(iv)
17
(v)
4
Question
33
33.
The arithmetic mean of
41
49
9
20
3
23
38
is
(i)
28.14
(ii)
24.14
(iii)
25.14
(iv)
26.14
(v)
27.14
Assignment Key
1) (v)
2) (i)
3) (i)
4) (iii)
5) (i)
6) (ii)
7) (ii)
8) (iv)
9) (ii)
10) (i)
11) (i)
12) (ii)
13) (i)
14) (iii)
15) (i)
16) (iv)
17) (ii)
18) (v)
19) (i)
20) (iii)
21) (iii)
22) (iv)
23) (i)
24) (ii)
25) (v)
26) (i)
27) (v)
28) (iii)
29) (iv)
30) (ii)
31) (iv)
32) (ii)
33) (iv)
