EduSahara™ Assignment
Name : Mean of Raw Data
Chapter : Statistics
Grade : SSC Grade IX
License : Non Commercial Use
Question
1
1.
The scores obtained by 10 students in a test are given below. Find the mean score.
2
11
10
11
16
12
17
13
8
10
(i)
2
(ii)
17
(iii)
11
(iv)
10
(v)
15
Question
2
2.
The marks obtained by 15 students in a test are given below. Find their mean marks.
9
41
9
40
50
6
37
37
38
40
29
35
32
1
1
(i)
25
(ii)
30
(iii)
27
(iv)
26
(v)
28
Question
3
3.
Heights of 10 students (in cm) are given below. Find the mean height.
156
167
135
137
156
136
162
144
145
137
(i)
295
2
cm
(ii)
299
2
cm
(iii)
148
cm
(iv)
297
2
cm
Question
4
4.
Heights of 10 plants (in cm) are given below. Find the mean height.
78
66
100
65
70
79
96
94
75
56
(i)
789
10
cm
(ii)
781
10
cm
(iii)
78
cm
(iv)
779
10
cm
(v)
799
10
cm
Question
5
5.
Ages of 15 students (in years) are given below. Find the mean age.
15
10
10
13
15
13
12
12
15
10
11
11
12
10
11
(i)
10
years
(ii)
11
years
(iii)
14
years
(iv)
12
years
(v)
13
years
Question
6
6.
Rainfall of 13 days (in mm) are given below. Find the mean rainfall.
5
12
11
11
12
13
12
8
7
11
7
12
11
(i)
145
13
mm
(ii)
132
13
mm
(iii)
133
13
mm
(iv)
158
13
mm
(v)
134
13
mm
Question
7
7.
Scores of 14 students are given below. Find the mean score.
86
75
77
76
72
81
80
72
85
89
80
74
88
79
(i)
558
7
(ii)
571
7
(iii)
564
7
(iv)
557
7
(v)
559
7
Question
8
8.
Temperatures of 10 days (in °C) are given below. Find the mean temperature.
31
31
26
33
25
31
35
30
29
35
(i)
163
5
°C
(ii)
158
5
°C
(iii)
153
5
°C
(iv)
154
5
°C
(v)
31
°C
Question
9
9.
Weights of 11 students (in kg) are given below. Find the mean weight.
58
40
60
58
59
44
56
51
55
54
46
(i)
603
11
kg
(ii)
53
kg
(iii)
581
11
kg
(iv)
592
11
kg
(v)
582
11
kg
Question
10
10.
Daily wages of 13 labourers (in ₹) are given below. Find the mean wage.
385
364
385
483
419
435
329
435
417
377
461
362
437
(i)
₹
408.85
(ii)
₹
407.00
(iii)
₹
406.85
(iv)
₹
407.85
(v)
₹
406.92
Question
11
11.
The arithmetic mean of
34
50
35
19
1
6
is
(i)
26.17
(ii)
25.17
(iii)
23.17
(iv)
24.17
(v)
22.17
Question
12
12.
If the mean of
9
3
10
7
x
4
8
5
is
5
7
8
,
find the value of x.
(i)
1
(ii)
4
(iii)
-2
(iv)
2
(v)
0
Question
13
13.
The mean of the below random sample is
30
3
5
.
Find the missing quantity.
45
14
49
32
14
x
23
30
18
39
(i)
45
(ii)
43
(iii)
41
(iv)
42
(v)
39
Question
14
14.
Given the mean of
12
samples as
10
7
12
,
what is the mean if a sample value is
increased
by
13
?
(i)
37
3
(ii)
11
(iii)
57
5
(iv)
13
(v)
35
3
Question
15
15.
Given the mean of
7
samples as
10
2
7
,
what is the mean if a sample value is
decreased
by
17
?
(i)
23
3
(ii)
53
7
(iii)
55
7
(iv)
57
7
(v)
41
5
Question
16
16.
Given the mean of
10
samples as
4
,
what is the new mean if two samples
4
and
10
are added ?
(i)
9
2
(ii)
5
(iii)
17
4
(iv)
11
2
(v)
7
2
Question
17
17.
Given the mean of
12
samples as
4
1
4
,
what is the new mean if two samples
10
and
4
are removed ?
(i)
37
10
(ii)
39
10
(iii)
7
2
(iv)
31
8
(v)
43
12
Question
18
18.
Find the mean of all prime numbers between 20 and 80.
(i)
53
(ii)
51
(iii)
50
(iv)
49
(v)
52
Question
19
19.
Find the mean of all prime numbers between 20 and 70.
(i)
493
11
(ii)
491
11
(iii)
579
13
(iv)
403
9
(v)
489
11
Question
20
20.
Find the mean of first 8 multiples of 8.
(i)
39
(ii)
33
(iii)
35
(iv)
37
(v)
36
Question
21
21.
Find the mean of first 9 whole numbers.
(i)
7
(ii)
2
(iii)
3
(iv)
5
(v)
4
Question
22
22.
Find the mean of first 7 multiples of 13.
(i)
50
(ii)
51
(iii)
52
(iv)
55
(v)
53
Question
23
23.
Find the mean of the first 15 odd numbers.
(i)
14
(ii)
18
(iii)
16
(iv)
15
(v)
12
Question
24
24.
Find the mean of the first 15 even numbers.
(i)
18
(ii)
17
(iii)
14
(iv)
16
(v)
15
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.
40
3
42
17
29
2
34
28
29
42
11
22
21
32
(i)
188
7
(ii)
136
5
(iii)
190
7
(iv)
192
7
(v)
244
9
Question
26
26.
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 2.
48
38
26
36
46
28
42
7
31
43
46
28
33
(i)
362
11
(ii)
426
13
(iii)
424
13
(iv)
98
3
(v)
428
13
Question
27
27.
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 doubled.
4
24
14
47
19
31
29
33
16
31
4
46
2
(i)
692
15
(ii)
508
11
(iii)
602
13
(iv)
600
13
(v)
46
Question
28
28.
If the mean of
6
samples is
27
1
2
,
what is the new mean if each number is multiplied by
3
.
(i)
165
2
(ii)
163
2
(iii)
329
4
(iv)
167
2
(v)
83
Question
29
29.
The mean of
9
numbers is
11
1
3
.
Upon
excluding
one number,
the mean becomes
11
1
2
.
Find the
excluded
number.
(i)
8
(ii)
11
(iii)
9
(iv)
10
(v)
12
Question
30
30.
The mean of
7
numbers is
11
6
7
.
Upon
adding
one number,
the mean becomes
12
7
8
.
Find the
included
number.
(i)
23
(ii)
18
(iii)
21
(iv)
19
(v)
20
Assignment Key
1) (iii)
2) (iii)
3) (i)
4) (iv)
5) (iv)
6) (ii)
7) (iv)
8) (iii)
9) (iii)
10) (iii)
11) (iv)
12) (i)
13) (iv)
14) (v)
15) (iii)
16) (i)
17) (i)
18) (ii)
19) (ii)
20) (v)
21) (v)
22) (iii)
23) (iv)
24) (iv)
25) (iii)
26) (ii)
27) (iv)
28) (i)
29) (iv)
30) (v)
