EduSahara™ Assignment
Name : Mean of Raw Data
Chapter : Mean and Median of Ungrouped Data
Grade : ICSE Grade IX
License : Non Commercial Use
Question
1
1.
The scores obtained by 14 students in a test are given below. Find the mean score.
20
7
13
8
14
14
20
10
3
11
20
10
4
18
(i)
17
(ii)
12
(iii)
3
(iv)
20
(v)
12
2
7
Question
2
2.
If the mean of
10
9
2
x
4
3
6
is
6
,
find the value of x.
(i)
9
(ii)
10
(iii)
8
(iv)
5
(v)
7
Question
3
3.
The mean of the below random sample is
29
1
5
.
Find the missing quantity.
45
36
16
45
40
11
40
14
12
x
(i)
36
(ii)
32
(iii)
31
(iv)
33
(v)
34
Question
4
4.
Given the mean of
12
samples as
11
1
4
,
what is the mean if a sample value is
increased
by
17
?
(i)
40
3
(ii)
12
(iii)
38
3
(iv)
62
5
(v)
14
Question
5
5.
Given the mean of
13
samples as
9
11
13
,
what is the mean if a sample value is
decreased
by
16
?
(i)
96
11
(ii)
114
13
(iii)
112
13
(iv)
128
15
(v)
110
13
Question
6
6.
Given the mean of
10
samples as
4
3
10
,
what is the new mean if two samples
1
and
10
are added ?
(i)
9
2
(ii)
11
2
(iii)
5
(iv)
7
2
(v)
17
4
Question
7
7.
Given the mean of
12
samples as
6
1
12
,
what is the new mean if two samples
9
and
4
are removed ?
(i)
3
(ii)
7
(iii)
5
(iv)
8
(v)
6
Question
8
8.
Find the mean of all prime numbers between 10 and 100.
(i)
49
(ii)
247
5
(iii)
51
(iv)
149
3
(v)
151
3
Question
9
9.
Find the mean of all prime numbers between 10 and 100.
(i)
247
5
(ii)
51
(iii)
151
3
(iv)
49
(v)
149
3
Question
10
10.
Find the mean of first 10 multiples of 9.
(i)
97
2
(ii)
99
2
(iii)
50
(iv)
197
4
(v)
101
2
Question
11
11.
Find the mean of first 5 whole numbers.
(i)
1
(ii)
2
(iii)
4
(iv)
-1
(v)
3
Question
12
12.
Find the mean of first 7 multiples of 8.
(i)
29
(ii)
35
(iii)
32
(iv)
33
(v)
31
Question
13
13.
Find the mean of the first 15 odd numbers.
(i)
14
(ii)
16
(iii)
15
(iv)
17
(v)
13
Question
14
14.
Find the mean of the first 15 even numbers.
(i)
13
(ii)
18
(iii)
17
(iv)
15
(v)
16
Question
15
15.
The marks obtained by 10 students in a test are given below. Find their mean marks.
50
21
32
46
39
32
36
39
3
25
(i)
321
10
(ii)
65
2
(iii)
323
10
(iv)
259
8
(v)
129
4
Question
16
16.
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 increased by 5.
18
6
42
16
32
10
22
13
34
22
(i)
51
2
(ii)
105
4
(iii)
27
(iv)
55
2
(v)
53
2
Question
17
17.
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.
25
49
11
1
43
13
29
43
41
26
36
19
1
38
(i)
275
12
(ii)
321
14
(iii)
317
14
(iv)
319
14
(v)
363
16
Question
18
18.
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 doubled.
11
41
35
37
35
31
37
19
5
2
19
25
34
36
(i)
367
7
(ii)
263
5
(iii)
369
7
(iv)
157
3
(v)
365
7
Question
19
19.
Heights of 10 students (in cm) are given below. Find the mean height.
128
173
136
166
146
165
132
146
175
175
(i)
772
5
cm
(ii)
781
5
cm
(iii)
771
5
cm
(iv)
776
5
cm
(v)
773
5
cm
Question
20
20.
Heights of 15 plants (in cm) are given below. Find the mean height.
83
84
78
72
58
54
74
66
69
80
66
52
99
99
65
(i)
1129
15
cm
(ii)
1114
15
cm
(iii)
1099
15
cm
(iv)
220
3
cm
(v)
367
5
cm
Question
21
21.
Ages of 14 students (in years) are given below. Find the mean age.
12
11
11
14
13
11
11
14
13
13
11
15
14
15
(i)
89
7
years
(ii)
96
7
years
(iii)
103
7
years
(iv)
90
7
years
(v)
13
years
Question
22
22.
Rainfall of 12 days (in mm) are given below. Find the mean rainfall.
11
9
9
8
9
15
15
5
6
6
11
8
(i)
28
3
mm
(ii)
31
3
mm
(iii)
10
mm
(iv)
34
3
mm
(v)
29
3
mm
Question
23
23.
Temperatures of 13 days (in °C) are given below. Find the mean temperature.
34
28
35
30
35
30
29
29
33
26
25
31
35
(i)
402
13
°C
(ii)
413
13
°C
(iii)
401
13
°C
(iv)
426
13
°C
(v)
400
13
°C
Question
24
24.
Weights of 14 students (in kg) are given below. Find the mean weight.
51
45
58
44
54
51
48
55
49
57
47
58
45
44
(i)
354
7
kg
(ii)
355
7
kg
(iii)
367
7
kg
(iv)
353
7
kg
(v)
360
7
kg
Question
25
25.
Daily wages of 13 labourers (in ₹) are given below. Find the mean wage.
354
442
331
420
467
416
407
431
450
322
434
355
372
(i)
₹
400.15
(ii)
₹
400.08
(iii)
₹
401.08
(iv)
₹
400.23
(v)
₹
402.08
Question
26
26.
If the mean of
8
samples is
27
3
8
,
what is the new mean if
5
is added to each number.
(i)
257
8
(ii)
65
2
(iii)
323
10
(iv)
259
8
(v)
261
8
Question
27
27.
If the mean of
8
samples is
14
7
8
,
what is the new mean if
4
is subtracted from each number.
(i)
107
10
(ii)
89
8
(iii)
67
6
(iv)
87
8
(v)
85
8
Question
28
28.
If the mean of
6
samples is
33
1
2
,
what is the new mean if each number is multiplied by
6
.
(i)
202
(ii)
203
(iii)
200
(iv)
198
(v)
201
Question
29
29.
The mean of
5
numbers is
9
3
5
.
Upon
adding
one number,
the mean becomes
8
1
6
.
Find the
included
number.
(i)
-2
(ii)
1
(iii)
4
(iv)
2
(v)
0
Question
30
30.
Scores of 13 students are given below. Find the mean score.
90
90
76
84
73
70
80
83
77
87
85
85
75
(i)
1057
13
(ii)
1056
13
(iii)
1081
13
(iv)
1055
13
(v)
1068
13
Question
31
31.
The mean of
7
numbers is
12
.
Upon
excluding
one number,
the mean becomes
11
.
Find the
excluded
number.
(i)
17
(ii)
18
(iii)
21
(iv)
19
(v)
16
Assignment Key
1) (v)
2) (iii)
3) (iv)
4) (iii)
5) (iii)
6) (i)
7) (v)
8) (iv)
9) (v)
10) (ii)
11) (ii)
12) (iii)
13) (iii)
14) (v)
15) (iii)
16) (v)
17) (iv)
18) (i)
19) (iii)
20) (iii)
21) (i)
22) (i)
23) (v)
24) (iv)
25) (ii)
26) (iv)
27) (iv)
28) (v)
29) (ii)
30) (iv)
31) (ii)
