EduSahara™ Assignment
Name : Mean of Raw Data
Chapter : Statistics
Grade : SSC Grade IX
License : Non Commercial Use
Question
1
1.
The scores obtained by 6 students in a test are given below. Find the mean score.
11
4
16
10
14
4
(i)
10
1
2
(ii)
9
5
6
(iii)
12
(iv)
16
(v)
4
Question
2
2.
The marks obtained by 13 students in a test are given below. Find their mean marks.
32
6
22
46
12
20
37
1
46
10
43
5
34
(i)
266
11
(ii)
314
13
(iii)
24
(iv)
362
15
(v)
316
13
Question
3
3.
Heights of 14 students (in cm) are given below. Find the mean height.
127
152
165
131
175
144
161
152
139
146
144
168
162
159
(i)
1063
7
cm
(ii)
2139
14
cm
(iii)
2125
14
cm
(iv)
2153
14
cm
(v)
2127
14
cm
Question
4
4.
Heights of 10 plants (in cm) are given below. Find the mean height.
99
89
84
73
82
83
74
85
64
66
(i)
809
10
cm
(ii)
801
10
cm
(iii)
799
10
cm
(iv)
819
10
cm
(v)
80
cm
Question
5
5.
Ages of 14 students (in years) are given below. Find the mean age.
13
14
12
15
11
14
11
11
11
12
14
15
14
10
(i)
177
14
years
(ii)
191
14
years
(iii)
205
14
years
(iv)
179
14
years
(v)
89
7
years
Question
6
6.
Rainfall of 11 days (in mm) are given below. Find the mean rainfall.
5
6
11
8
14
13
13
8
13
9
11
(i)
122
11
mm
(ii)
133
11
mm
(iii)
111
11
mm
(iv)
112
11
mm
(v)
113
11
mm
Question
7
7.
Scores of 15 students are given below. Find the mean score.
77
78
82
71
76
73
71
79
87
77
78
86
85
73
89
(i)
399
5
(ii)
79
(iii)
394
5
(iv)
396
5
(v)
404
5
Question
8
8.
Temperatures of 12 days (in °C) are given below. Find the mean temperature.
26
31
31
29
33
25
26
32
25
31
29
35
(i)
365
12
°C
(ii)
59
2
°C
(iii)
377
12
°C
(iv)
355
12
°C
(v)
353
12
°C
Question
9
9.
Weights of 10 students (in kg) are given below. Find the mean weight.
47
53
40
58
60
45
43
60
54
53
(i)
533
10
kg
(ii)
257
5
kg
(iii)
523
10
kg
(iv)
513
10
kg
(v)
103
2
kg
Question
10
10.
Daily wages of 11 labourers (in ₹) are given below. Find the mean wage.
488
412
345
389
345
324
395
432
480
479
402
(i)
₹
410.27
(ii)
₹
408.27
(iii)
₹
408.36
(iv)
₹
408.45
(v)
₹
409.27
Question
11
11.
The arithmetic mean of
12
21
23
1
42
5
is
(i)
18.33
(ii)
17.33
(iii)
19.33
(iv)
16.33
(v)
15.33
Question
12
12.
If the mean of
1
3
x
4
8
is
4
1
5
,
find the value of x.
(i)
2
(ii)
7
(iii)
5
(iv)
6
(v)
4
Question
13
13.
The mean of the below random sample is
27
9
10
.
Find the missing quantity.
x
39
43
21
11
33
34
39
11
27
(i)
22
(ii)
23
(iii)
18
(iv)
20
(v)
21
Question
14
14.
Given the mean of
11
samples as
11
3
11
,
what is the mean if a sample value is
increased
by
14
?
(i)
162
13
(ii)
140
11
(iii)
138
11
(iv)
38
3
(v)
136
11
Question
15
15.
Given the mean of
13
samples as
10
6
13
,
what is the mean if a sample value is
decreased
by
18
?
(i)
100
11
(ii)
120
13
(iii)
136
15
(iv)
116
13
(v)
118
13
Question
16
16.
Given the mean of
10
samples as
6
3
5
,
what is the new mean if two samples
3
and
3
are added ?
(i)
4
(ii)
8
(iii)
6
(iv)
7
(v)
5
Question
17
17.
Given the mean of
12
samples as
5
3
4
,
what is the new mean if two samples
9
and
7
are removed ?
(i)
43
8
(ii)
51
10
(iii)
21
4
(iv)
53
10
(v)
11
2
Question
18
18.
Find the mean of all prime numbers between 10 and 90.
(i)
379
8
(ii)
95
2
(iii)
189
4
(iv)
471
10
(v)
473
10
Question
19
19.
Find the mean of all prime numbers between 20 and 90.
(i)
111
2
(ii)
441
8
(iii)
443
8
(iv)
445
8
(v)
553
10
Question
20
20.
Find the mean of first 7 multiples of 15.
(i)
59
(ii)
62
(iii)
57
(iv)
60
(v)
61
Question
21
21.
Find the mean of first 10 whole numbers.
(i)
5
(ii)
7
2
(iii)
11
2
(iv)
17
4
(v)
9
2
Question
22
22.
Find the mean of first 7 multiples of 10.
(i)
41
(ii)
43
(iii)
40
(iv)
37
(v)
39
Question
23
23.
Find the mean of the first 20 odd numbers.
(i)
18
(ii)
21
(iii)
19
(iv)
22
(v)
20
Question
24
24.
Find the mean of the first 20 even numbers.
(i)
21
(ii)
22
(iii)
23
(iv)
19
(v)
20
Question
25
25.
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 2.
11
22
26
14
25
12
40
10
15
3
16
15
10
20
(i)
269
14
(ii)
229
12
(iii)
267
14
(iv)
265
14
(v)
305
16
Question
26
26.
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 4.
9
23
10
12
31
15
32
36
3
22
(i)
123
8
(ii)
31
2
(iii)
153
10
(iv)
151
10
(v)
61
4
Question
27
27.
The marks obtained by 12 students in a test are given below. Find the mean of their marks when the marks of each student is doubled.
44
24
47
26
1
44
17
22
41
14
36
5
(i)
213
4
(ii)
105
2
(iii)
107
2
(iv)
109
2
(v)
54
Question
28
28.
If the mean of
8
samples is
28
3
4
,
what is the new mean if each number is multiplied by
4
.
(i)
112
(ii)
114
(iii)
115
(iv)
118
(v)
116
Question
29
29.
The mean of
8
numbers is
12
5
8
.
Upon
excluding
one number,
the mean becomes
11
6
7
.
Find the
excluded
number.
(i)
17
(ii)
15
(iii)
18
(iv)
19
(v)
21
Question
30
30.
The mean of
7
numbers is
15
.
Upon
adding
one number,
the mean becomes
15
1
2
.
Find the
included
number.
(i)
18
(ii)
21
(iii)
20
(iv)
17
(v)
19
Assignment Key
1) (ii)
2) (ii)
3) (iii)
4) (iii)
5) (i)
6) (iii)
7) (iii)
8) (v)
9) (iv)
10) (ii)
11) (ii)
12) (iii)
13) (v)
14) (iii)
15) (v)
16) (iii)
17) (iv)
18) (v)
19) (iii)
20) (iv)
21) (v)
22) (iii)
23) (v)
24) (i)
25) (iii)
26) (iii)
27) (iii)
28) (iii)
29) (iii)
30) (v)
