EduSahara™ Assignment
Name : Mean of Raw Data
Chapter : Statistics
Grade : SSC Grade IX
License : Non Commercial Use
Question
1
1.
The scores obtained by 8 students in a test are given below. Find the mean score.
12
12
12
7
19
1
9
17
(i)
19
(ii)
18
(iii)
11
1
8
(iv)
12
(v)
1
Question
2
2.
The marks obtained by 11 students in a test are given below. Find their mean marks.
41
40
7
20
33
43
38
29
22
41
31
(i)
345
11
(ii)
343
11
(iii)
347
11
(iv)
283
9
(v)
407
13
Question
3
3.
Heights of 10 students (in cm) are given below. Find the mean height.
126
129
169
155
162
134
153
157
152
160
(i)
1499
10
cm
(ii)
749
5
cm
(iii)
1507
10
cm
(iv)
1497
10
cm
(v)
1517
10
cm
Question
4
4.
Heights of 15 plants (in cm) are given below. Find the mean height.
98
52
66
82
62
52
57
66
73
65
79
59
93
60
56
(i)
66
cm
(ii)
70
cm
(iii)
69
cm
(iv)
68
cm
(v)
67
cm
Question
5
5.
Ages of 12 students (in years) are given below. Find the mean age.
10
15
13
14
10
15
13
14
10
14
10
15
(i)
55
4
years
(ii)
53
4
years
(iii)
13
years
(iv)
59
4
years
(v)
51
4
years
Question
6
6.
Rainfall of 14 days (in mm) are given below. Find the mean rainfall.
14
12
12
8
6
11
11
13
12
12
13
7
11
7
(i)
177
14
mm
(ii)
149
14
mm
(iii)
75
7
mm
(iv)
151
14
mm
(v)
163
14
mm
Question
7
7.
Scores of 12 students are given below. Find the mean score.
72
89
71
82
73
84
84
89
76
74
86
89
(i)
331
4
(ii)
81
(iii)
325
4
(iv)
323
4
(v)
327
4
Question
8
8.
Temperatures of 13 days (in °C) are given below. Find the mean temperature.
26
34
25
32
33
30
28
30
32
34
30
27
32
(i)
394
13
°C
(ii)
395
13
°C
(iii)
393
13
°C
(iv)
419
13
°C
(v)
406
13
°C
Question
9
9.
Weights of 15 students (in kg) are given below. Find the mean weight.
51
53
41
51
54
55
57
46
43
41
55
55
44
56
40
(i)
757
15
kg
(ii)
742
15
kg
(iii)
772
15
kg
(iv)
743
15
kg
(v)
248
5
kg
Question
10
10.
Daily wages of 15 labourers (in ₹) are given below. Find the mean wage.
332
422
371
346
303
439
495
476
373
431
490
411
419
492
484
(i)
₹
418.93
(ii)
₹
419.07
(iii)
₹
420.93
(iv)
₹
419.93
(v)
₹
419.00
Question
11
11.
The arithmetic mean of
15
42
2
35
33
24
is
(i)
26.17
(ii)
24.17
(iii)
23.17
(iv)
25.17
(v)
27.17
Question
12
12.
If the mean of
6
5
1
4
x
3
2
7
is
4
1
2
,
find the value of x.
(i)
8
(ii)
7
(iii)
11
(iv)
9
(v)
6
Question
13
13.
The mean of the below random sample is
30
4
5
.
Find the missing quantity.
50
x
12
18
37
23
33
33
42
35
(i)
27
(ii)
26
(iii)
23
(iv)
25
(v)
24
Question
14
14.
Given the mean of
11
samples as
11
2
11
,
what is the mean if a sample value is
increased
by
10
?
(i)
133
11
(ii)
109
9
(iii)
135
11
(iv)
157
13
(v)
131
11
Question
15
15.
Given the mean of
5
samples as
7
2
5
,
what is the mean if a sample value is
decreased
by
10
?
(i)
5
(ii)
27
5
(iii)
37
7
(iv)
17
3
(v)
29
5
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)
23
4
(ii)
11
2
(iii)
21
4
(iv)
25
4
(v)
13
2
Question
17
17.
Given the mean of
12
samples as
6
7
12
,
what is the new mean if two samples
7
and
4
are removed ?
(i)
22
3
(ii)
46
7
(iii)
32
5
(iv)
36
5
(v)
34
5
Question
18
18.
Find the mean of all prime numbers between 20 and 70.
(i)
403
9
(ii)
579
13
(iii)
491
11
(iv)
489
11
(v)
493
11
Question
19
19.
Find the mean of all prime numbers between 30 and 70.
(i)
535
11
(ii)
49
(iii)
439
9
(iv)
437
9
Question
20
20.
Find the mean of first 5 multiples of 18.
(i)
54
(ii)
52
(iii)
56
(iv)
53
(v)
55
Question
21
21.
Find the mean of first 5 whole numbers.
(i)
4
(ii)
1
(iii)
2
(iv)
3
(v)
-1
Question
22
22.
Find the mean of first 10 multiples of 16.
(i)
91
(ii)
87
(iii)
88
(iv)
89
(v)
85
Question
23
23.
Find the mean of the first 10 odd numbers.
(i)
10
(ii)
11
(iii)
7
(iv)
12
(v)
9
Question
24
24.
Find the mean of the first 20 even numbers.
(i)
20
(ii)
22
(iii)
24
(iv)
18
(v)
21
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 3.
7
15
50
29
5
37
46
39
41
31
11
19
(i)
59
2
(ii)
63
2
(iii)
31
(iv)
121
4
(v)
61
2
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 4.
49
31
25
20
47
10
35
20
7
12
24
40
18
14
(i)
148
7
(ii)
146
7
(iii)
106
5
(iv)
190
9
(v)
150
7
Question
27
27.
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.
4
48
23
34
15
36
15
8
20
22
(i)
46
(ii)
45
(iii)
47
(iv)
42
(v)
44
Question
28
28.
If the mean of
6
samples is
35
2
3
,
what is the new mean if each number is multiplied by
6
.
(i)
216
(ii)
213
(iii)
215
(iv)
212
(v)
214
Question
29
29.
The mean of
10
numbers is
11
3
5
.
Upon
excluding
one number,
the mean becomes
11
.
Find the
excluded
number.
(i)
17
(ii)
16
(iii)
19
(iv)
14
(v)
18
Question
30
30.
The mean of
7
numbers is
11
4
7
.
Upon
adding
one number,
the mean becomes
11
1
4
.
Find the
included
number.
(i)
6
(ii)
10
(iii)
8
(iv)
9
(v)
11
Assignment Key
1) (iii)
2) (i)
3) (iv)
4) (iv)
5) (v)
6) (ii)
7) (iv)
8) (iii)
9) (ii)
10) (i)
11) (iv)
12) (i)
13) (iv)
14) (i)
15) (ii)
16) (i)
17) (v)
18) (iii)
19) (iii)
20) (i)
21) (iii)
22) (iii)
23) (i)
24) (v)
25) (v)
26) (i)
27) (ii)
28) (v)
29) (i)
30) (iv)
