EduSahara™ Assignment
Name : Mean of Raw Data
Chapter : Statistics
Grade : CBSE Grade IX
License : Non Commercial Use
Question
1
1.
If the mean of
10
8
x
9
5
is
6
4
5
,
find the value of x.
(i)
-1
(ii)
3
(iii)
1
(iv)
4
(v)
2
Question
2
2.
The mean of the below random sample is
35
1
5
.
Find the missing quantity.
21
49
47
30
49
38
39
34
10
x
(i)
36
(ii)
34
(iii)
33
(iv)
37
(v)
35
Question
3
3.
Given the mean of
15
samples as
12
2
5
,
what is the mean if a sample value is
increased
by
12
?
(i)
66
5
(ii)
40
3
(iii)
92
7
(iv)
64
5
(v)
68
5
Question
4
4.
Given the mean of
7
samples as
12
5
7
,
what is the mean if a sample value is
decreased
by
16
?
(i)
75
7
(ii)
53
5
(iii)
31
3
(iv)
73
7
(v)
71
7
Question
5
5.
Given the mean of
10
samples as
5
1
5
,
what is the new mean if two samples
3
and
4
are added ?
(i)
51
10
(ii)
19
4
(iii)
61
12
(iv)
67
14
(v)
59
12
Question
6
6.
Given the mean of
12
samples as
4
7
12
,
what is the new mean if two samples
5
and
1
are removed ?
(i)
49
10
(ii)
51
10
(iii)
19
4
(iv)
41
8
(v)
47
10
Question
7
7.
Find the mean of all prime numbers between 20 and 70.
(i)
579
13
(ii)
493
11
(iii)
403
9
(iv)
491
11
(v)
489
11
Question
8
8.
Find the mean of all prime numbers between 30 and 80.
(i)
329
6
(ii)
221
4
(iii)
331
6
(iv)
111
2
(v)
441
8
Question
9
9.
Find the mean of first 10 multiples of 4.
(i)
22
(ii)
19
(iii)
21
(iv)
23
(v)
24
Question
10
10.
Find the mean of first 5 whole numbers.
(i)
2
(ii)
4
(iii)
-1
(iv)
3
(v)
1
Question
11
11.
Find the mean of first 6 multiples of 2.
(i)
5
(ii)
10
(iii)
7
(iv)
6
(v)
8
Question
12
12.
Find the mean of the first 10 odd numbers.
(i)
8
(ii)
10
(iii)
11
(iv)
9
(v)
13
Question
13
13.
Find the mean of the first 20 even numbers.
(i)
22
(ii)
18
(iii)
23
(iv)
20
(v)
21
Question
14
14.
The marks obtained by 10 students in a test are given below. Find their mean marks.
14
27
43
26
20
20
39
46
35
17
(i)
231
8
(ii)
343
12
(iii)
287
10
(iv)
289
10
(v)
57
2
Question
15
15.
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 6.
42
49
36
34
6
13
28
22
28
29
8
47
8
46
42
(i)
106
3
(ii)
176
5
(iii)
178
5
(iv)
174
5
(v)
246
7
Question
16
16.
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 6.
40
34
18
36
20
16
26
14
47
30
49
43
41
(i)
334
13
(ii)
386
15
(iii)
26
(iv)
336
13
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 doubled.
49
28
49
19
27
27
29
4
31
41
25
33
31
7
19
(i)
838
15
(ii)
948
17
(iii)
56
(iv)
836
15
Question
18
18.
Heights of 13 students (in cm) are given below. Find the mean height.
133
150
160
162
133
127
131
142
150
127
142
166
138
(i)
1874
13
cm
(ii)
1863
13
cm
(iii)
1887
13
cm
(iv)
1862
13
cm
(v)
1861
13
cm
Question
19
19.
Heights of 11 plants (in cm) are given below. Find the mean height.
96
74
73
86
88
68
63
58
80
75
91
(i)
852
11
cm
(ii)
853
11
cm
(iii)
854
11
cm
(iv)
874
11
cm
(v)
863
11
cm
Question
20
20.
Ages of 13 students (in years) are given below. Find the mean age.
13
10
11
12
15
10
15
15
13
15
10
15
11
(i)
178
13
years
(ii)
167
13
years
(iii)
165
13
years
(iv)
191
13
years
(v)
166
13
years
Question
21
21.
Rainfall of 13 days (in mm) are given below. Find the mean rainfall.
6
12
5
13
12
6
12
13
15
11
10
7
12
(i)
147
13
mm
(ii)
135
13
mm
(iii)
134
13
mm
(iv)
136
13
mm
(v)
160
13
mm
Question
22
22.
Scores of 14 students are given below. Find the mean score.
73
87
77
85
90
79
78
77
73
74
85
76
82
70
(i)
78
(ii)
81
(iii)
79
(iv)
80
(v)
77
Question
23
23.
Temperatures of 10 days (in °C) are given below. Find the mean temperature.
28
35
32
32
29
31
31
30
35
35
(i)
169
5
°C
(ii)
164
5
°C
(iii)
159
5
°C
(iv)
32
°C
(v)
161
5
°C
Question
24
24.
Weights of 10 students (in kg) are given below. Find the mean weight.
41
51
46
52
46
49
45
42
40
40
(i)
226
5
kg
(ii)
228
5
kg
(iii)
231
5
kg
(iv)
227
5
kg
(v)
236
5
kg
Question
25
25.
Daily wages of 10 labourers (in ₹) are given below. Find the mean wage.
377
399
431
327
454
418
383
428
477
462
(i)
₹
416.60
(ii)
₹
416.00
(iii)
₹
417.60
(iv)
₹
415.80
(v)
₹
415.60
Question
26
26.
The arithmetic mean of a + 2, a, and a - 2 is
(i)
3a
(ii)
a
(iii)
a - 2
(iv)
a + 2
Question
27
27.
If the mean of
4
samples is
21
3
4
,
what is the new mean if
8
is added to each number.
(i)
61
2
(ii)
117
4
(iii)
119
4
(iv)
59
2
(v)
121
4
Question
28
28.
If the mean of
8
samples is
26
3
8
,
what is the new mean if
9
is subtracted from each number.
(i)
139
8
(ii)
173
10
(iii)
137
8
(iv)
35
2
(v)
141
8
Question
29
29.
If the mean of
5
samples is
26
2
5
,
what is the new mean if each number is multiplied by
3
.
(i)
554
7
(ii)
394
5
(iii)
396
5
(iv)
398
5
(v)
238
3
Question
30
30.
The mean of
7
numbers is
11
5
7
.
Upon
excluding
one number,
the mean becomes
10
2
3
.
Find the
excluded
number.
(i)
18
(ii)
17
(iii)
16
(iv)
21
(v)
19
Question
31
31.
The mean of
8
numbers is
8
3
4
.
Upon
adding
one number,
the mean becomes
8
2
9
.
Find the
included
number.
(i)
3
(ii)
1
(iii)
4
(iv)
7
(v)
5
Question
32
32.
The scores obtained by 10 students in a test are given below. Find the mean score.
16
17
10
6
17
4
8
8
16
13
(i)
13
(ii)
8
(iii)
11
1
2
(iv)
4
(v)
17
Question
33
33.
The arithmetic mean of
28
44
14
8
15
38
24
29
is
(i)
27
(ii)
24
(iii)
26
(iv)
23
(v)
25
Assignment Key
1) (v)
2) (v)
3) (i)
4) (iv)
5) (v)
6) (i)
7) (iv)
8) (iii)
9) (i)
10) (i)
11) (iii)
12) (ii)
13) (v)
14) (iii)
15) (ii)
16) (iv)
17) (i)
18) (v)
19) (i)
20) (iii)
21) (iii)
22) (iii)
23) (iii)
24) (i)
25) (v)
26) (ii)
27) (iii)
28) (i)
29) (iii)
30) (i)
31) (iii)
32) (iii)
33) (v)
