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 11 students in a test are given below. Find the mean score.
1
15
12
18
18
2
19
4
9
4
2
(i)
9
5
11
(ii)
19
(iii)
18
(iv)
2
(v)
1
Question
2
2.
If the mean of
1
3
9
x
8
7
is
5
1
3
,
find the value of x.
(i)
7
(ii)
3
(iii)
4
(iv)
5
(v)
1
Question
3
3.
The mean of the below random sample is
27
7
10
.
Find the missing quantity.
22
x
47
45
35
21
13
34
14
14
(i)
32
(ii)
33
(iii)
34
(iv)
31
(v)
30
Question
4
4.
Given the mean of
8
samples as
13
1
8
,
what is the mean if a sample value is
increased
by
12
?
(i)
29
2
(ii)
117
8
(iii)
115
8
(iv)
119
8
(v)
89
6
Question
5
5.
Given the mean of
11
samples as
6
7
11
,
what is the mean if a sample value is
decreased
by
16
?
(i)
59
11
(ii)
5
(iii)
57
11
(iv)
67
13
(v)
47
9
Question
6
6.
Given the mean of
10
samples as
5
1
2
,
what is the new mean if two samples
4
and
8
are added ?
(i)
65
12
(ii)
11
2
(iii)
67
12
(iv)
57
10
(v)
23
4
Question
7
7.
Given the mean of
12
samples as
5
7
12
,
what is the new mean if two samples
3
and
10
are removed ?
(i)
29
5
(ii)
17
3
(iii)
37
7
(iv)
5
(v)
27
5
Question
8
8.
Find the mean of all prime numbers between 50 and 70.
(i)
57
(ii)
60
(iii)
63
(iv)
61
(v)
59
Question
9
9.
Find the mean of all prime numbers between 50 and 80.
(i)
331
5
(ii)
465
7
(iii)
461
7
(iv)
595
9
(v)
463
7
Question
10
10.
Find the mean of first 10 multiples of 8.
(i)
47
(ii)
45
(iii)
43
(iv)
44
(v)
41
Question
11
11.
Find the mean of first 5 whole numbers.
(i)
5
(ii)
1
(iii)
2
(iv)
3
(v)
0
Question
12
12.
Find the mean of first 7 multiples of 18.
(i)
73
(ii)
71
(iii)
72
(iv)
70
(v)
74
Question
13
13.
Find the mean of the first 10 odd numbers.
(i)
8
(ii)
11
(iii)
13
(iv)
9
(v)
10
Question
14
14.
Find the mean of the first 10 even numbers.
(i)
12
(ii)
10
(iii)
14
(iv)
8
(v)
11
Question
15
15.
The marks obtained by 10 students in a test are given below. Find their mean marks.
6
18
14
21
24
23
30
15
50
4
(i)
81
4
(ii)
41
2
(iii)
43
2
(iv)
21
(v)
39
2
Question
16
16.
The marks obtained by 15 students in a test are given below. Find the mean of their marks when the marks of each student is increased by 8.
36
9
19
28
31
35
17
19
33
22
14
4
30
36
9
(i)
152
5
(ii)
154
5
(iii)
156
5
(iv)
214
7
(v)
94
3
Question
17
17.
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 decreased by 5.
41
36
12
44
42
30
10
12
28
1
3
(i)
240
13
(ii)
56
3
(iii)
204
11
(iv)
202
11
(v)
206
11
Question
18
18.
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.
22
33
15
1
37
45
39
17
50
40
42
1
10
(i)
54
(ii)
812
15
(iii)
596
11
(iv)
706
13
(v)
704
13
Question
19
19.
Heights of 10 students (in cm) are given below. Find the mean height.
129
159
127
134
126
127
161
165
153
136
(i)
1417
10
cm
(ii)
709
5
cm
(iii)
1419
10
cm
(iv)
1427
10
cm
(v)
1437
10
cm
Question
20
20.
Heights of 13 plants (in cm) are given below. Find the mean height.
66
85
77
87
57
97
77
65
50
89
98
87
96
(i)
1033
13
cm
(ii)
1032
13
cm
(iii)
1044
13
cm
(iv)
1031
13
cm
(v)
1057
13
cm
Question
21
21.
Ages of 14 students (in years) are given below. Find the mean age.
15
15
10
10
14
11
11
12
11
11
12
11
13
10
(i)
90
7
years
(ii)
83
7
years
(iii)
97
7
years
(iv)
85
7
years
(v)
12
years
Question
22
22.
Rainfall of 11 days (in mm) are given below. Find the mean rainfall.
11
10
5
14
12
7
8
5
15
15
8
(i)
12
mm
(ii)
10
mm
(iii)
8
mm
(iv)
9
mm
(v)
11
mm
Question
23
23.
Temperatures of 14 days (in °C) are given below. Find the mean temperature.
27
31
34
31
34
29
26
31
34
34
32
28
25
26
(i)
211
7
°C
(ii)
213
7
°C
(iii)
225
7
°C
(iv)
218
7
°C
(v)
212
7
°C
Question
24
24.
Weights of 13 students (in kg) are given below. Find the mean weight.
40
57
41
43
54
45
44
58
54
57
45
53
56
(i)
660
13
kg
(ii)
649
13
kg
(iii)
648
13
kg
(iv)
647
13
kg
(v)
673
13
kg
Question
25
25.
Daily wages of 10 labourers (in ₹) are given below. Find the mean wage.
489
486
375
342
306
352
324
440
480
429
(i)
₹
403.30
(ii)
₹
402.50
(iii)
₹
402.30
(iv)
₹
404.30
(v)
₹
402.40
Question
26
26.
If the mean of
6
samples is
20
2
3
,
what is the new mean if
9
is added to each number.
(i)
147
5
(ii)
89
3
(iii)
31
(iv)
29
(v)
91
3
Question
27
27.
If the mean of
5
samples is
27
4
5
,
what is the new mean if
10
is subtracted from each number.
(i)
91
5
(ii)
89
5
(iii)
123
7
(iv)
55
3
(v)
87
5
Question
28
28.
If the mean of
4
samples is
12
1
2
,
what is the new mean if each number is multiplied by
8
.
(i)
100
(ii)
97
(iii)
103
(iv)
101
(v)
99
Question
29
29.
The mean of
5
numbers is
13
3
5
.
Upon
adding
one number,
the mean becomes
13
2
3
.
Find the
included
number.
(i)
15
(ii)
13
(iii)
16
(iv)
12
(v)
14
Question
30
30.
Scores of 15 students are given below. Find the mean score.
82
77
85
83
77
70
89
86
84
74
73
80
73
70
70
(i)
401
5
(ii)
396
5
(iii)
393
5
(iv)
391
5
(v)
392
5
Question
31
31.
The mean of
8
numbers is
12
7
8
.
Upon
excluding
one number,
the mean becomes
11
6
7
.
Find the
excluded
number.
(i)
18
(ii)
19
(iii)
22
(iv)
20
(v)
21
Assignment Key
1) (i)
2) (iii)
3) (i)
4) (ii)
5) (iii)
6) (iii)
7) (v)
8) (ii)
9) (v)
10) (iv)
11) (iii)
12) (iii)
13) (v)
14) (v)
15) (ii)
16) (ii)
17) (iii)
18) (v)
19) (i)
20) (iv)
21) (ii)
22) (ii)
23) (i)
24) (iv)
25) (iii)
26) (ii)
27) (ii)
28) (i)
29) (v)
30) (iv)
31) (iv)
