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.
10
16
17
3
4
6
(i)
17
(ii)
9
1
3
(iii)
3
(iv)
8
(v)
14
Question
2
2.
The marks obtained by 12 students in a test are given below. Find their mean marks.
34
40
16
39
48
35
33
20
47
36
33
4
(i)
321
10
(ii)
385
12
(iii)
449
14
(iv)
383
12
(v)
129
4
Question
3
3.
Heights of 10 students (in cm) are given below. Find the mean height.
161
172
171
144
141
136
165
153
130
166
(i)
1559
10
cm
(ii)
1541
10
cm
(iii)
1549
10
cm
(iv)
1539
10
cm
(v)
154
cm
Question
4
4.
Heights of 10 plants (in cm) are given below. Find the mean height.
60
52
100
71
80
66
70
93
70
50
(i)
361
5
cm
(ii)
366
5
cm
(iii)
358
5
cm
(iv)
356
5
cm
(v)
357
5
cm
Question
5
5.
Ages of 15 students (in years) are given below. Find the mean age.
13
14
10
10
11
10
10
10
14
11
10
14
10
15
13
(i)
35
3
years
(ii)
38
3
years
(iii)
41
3
years
(iv)
37
3
years
(v)
12
years
Question
6
6.
Rainfall of 11 days (in mm) are given below. Find the mean rainfall.
6
11
13
8
8
12
12
7
8
7
10
(i)
113
11
mm
(ii)
124
11
mm
(iii)
102
11
mm
(iv)
103
11
mm
(v)
104
11
mm
Question
7
7.
Scores of 12 students are given below. Find the mean score.
84
71
73
76
74
87
72
77
78
72
84
77
(i)
937
12
(ii)
309
4
(iii)
925
12
(iv)
949
12
(v)
463
6
Question
8
8.
Temperatures of 14 days (in °C) are given below. Find the mean temperature.
35
32
29
34
35
31
29
34
32
27
26
27
28
29
(i)
221
7
°C
(ii)
216
7
°C
(iii)
214
7
°C
(iv)
215
7
°C
(v)
228
7
°C
Question
9
9.
Weights of 11 students (in kg) are given below. Find the mean weight.
57
60
59
58
40
44
45
58
41
45
52
(i)
559
11
kg
(ii)
581
11
kg
(iii)
51
kg
(iv)
560
11
kg
(v)
570
11
kg
Question
10
10.
Daily wages of 14 labourers (in ₹) are given below. Find the mean wage.
350
325
450
489
354
419
358
434
442
385
435
448
370
358
(i)
₹
403.21
(ii)
₹
402.21
(iii)
₹
401.21
(iv)
₹
401.29
(v)
₹
401.36
Question
11
11.
The arithmetic mean of
26
12
48
12
47
13
is
(i)
24.33
(ii)
28.33
(iii)
26.33
(iv)
27.33
(v)
25.33
Question
12
12.
If the mean of
4
8
x
10
2
is
6
3
5
,
find the value of x.
(i)
9
(ii)
10
(iii)
6
(iv)
8
(v)
11
Question
13
13.
The mean of the below random sample is
28
3
10
.
Find the missing quantity.
16
46
23
17
11
30
49
26
37
x
(i)
30
(ii)
28
(iii)
29
(iv)
27
(v)
25
Question
14
14.
Given the mean of
14
samples as
10
9
14
,
what is the mean if a sample value is
increased
by
14
?
(i)
163
14
(ii)
23
2
(iii)
47
4
(iv)
185
16
(v)
165
14
Question
15
15.
Given the mean of
14
samples as
9
3
7
,
what is the mean if a sample value is
decreased
by
12
?
(i)
44
5
(ii)
62
7
(iii)
58
7
(iv)
60
7
(v)
76
9
Question
16
16.
Given the mean of
10
samples as
5
1
2
,
what is the new mean if two samples
5
and
9
are added ?
(i)
13
2
(ii)
11
2
(iii)
25
4
(iv)
21
4
(v)
23
4
Question
17
17.
Given the mean of
12
samples as
6
5
12
,
what is the new mean if two samples
3
and
3
are removed ?
(i)
57
8
(ii)
73
10
(iii)
71
10
(iv)
69
10
(v)
85
12
Question
18
18.
Find the mean of all prime numbers between 30 and 90.
(i)
419
7
(ii)
535
9
(iii)
299
5
(iv)
415
7
(v)
417
7
Question
19
19.
Find the mean of all prime numbers between 20 and 90.
(i)
553
10
(ii)
111
2
(iii)
443
8
(iv)
445
8
(v)
441
8
Question
20
20.
Find the mean of first 9 multiples of 20.
(i)
102
(ii)
98
(iii)
100
(iv)
99
(v)
101
Question
21
21.
Find the mean of first 6 whole numbers.
(i)
3
(ii)
5
2
(iii)
7
2
(iv)
3
2
(v)
9
4
Question
22
22.
Find the mean of first 9 multiples of 6.
(i)
28
(ii)
29
(iii)
31
(iv)
32
(v)
30
Question
23
23.
Find the mean of the first 10 odd numbers.
(i)
13
(ii)
10
(iii)
11
(iv)
9
(v)
8
Question
24
24.
Find the mean of the first 15 even numbers.
(i)
19
(ii)
17
(iii)
13
(iv)
16
(v)
15
Question
25
25.
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 increased by 7.
1
21
10
50
38
21
28
10
16
27
37
43
(i)
191
6
(ii)
129
4
(iii)
193
6
(iv)
65
2
(v)
257
8
Question
26
26.
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 decreased by 10.
20
34
28
13
34
35
42
30
25
14
26
1
13
26
(i)
229
16
(ii)
199
14
(iii)
173
12
(iv)
29
2
(v)
201
14
Question
27
27.
The marks obtained by 11 students in a test are given below. Find the mean of their marks when the marks of each student is doubled.
3
29
42
42
19
28
16
11
49
29
47
(i)
630
11
(ii)
628
11
(iii)
744
13
(iv)
172
3
(v)
632
11
Question
28
28.
If the mean of
8
samples is
22
3
8
,
what is the new mean if each number is multiplied by
6
.
(i)
269
2
(ii)
539
4
(iii)
535
4
(iv)
805
6
(v)
537
4
Question
29
29.
The mean of
8
numbers is
12
1
2
.
Upon
excluding
one number,
the mean becomes
12
3
7
.
Find the
excluded
number.
(i)
12
(ii)
13
(iii)
10
(iv)
16
(v)
14
Question
30
30.
The mean of
6
numbers is
13
1
6
.
Upon
adding
one number,
the mean becomes
14
1
7
.
Find the
included
number.
(i)
22
(ii)
20
(iii)
18
(iv)
19
(v)
21
Assignment Key
1) (ii)
2) (ii)
3) (iv)
4) (iv)
5) (i)
6) (iii)
7) (iii)
8) (iii)
9) (i)
10) (iii)
11) (iii)
12) (i)
13) (ii)
14) (i)
15) (iv)
16) (v)
17) (iii)
18) (v)
19) (iii)
20) (iii)
21) (ii)
22) (v)
23) (ii)
24) (iv)
25) (iii)
26) (v)
27) (i)
28) (v)
29) (ii)
30) (ii)
