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 12 students in a test are given below. Find the mean score.
18
4
18
5
12
9
19
10
8
6
20
1
(i)
19
(ii)
9
1
2
(iii)
10
5
6
(iv)
20
(v)
1
Question
2
2.
If the mean of
9
5
x
6
2
is
5
1
5
,
find the value of x.
(i)
5
(ii)
2
(iii)
4
(iv)
6
(v)
3
Question
3
3.
The mean of the below random sample is
32
1
2
.
Find the missing quantity.
22
50
12
49
27
42
46
31
25
x
(i)
21
(ii)
22
(iii)
20
(iv)
19
(v)
24
Question
4
4.
Given the mean of
14
samples as
10
3
14
,
what is the mean if a sample value is
increased
by
14
?
(i)
155
14
(ii)
45
4
(iii)
159
14
(iv)
157
14
(v)
179
16
Question
5
5.
Given the mean of
13
samples as
13
,
what is the mean if a sample value is
decreased
by
16
?
(i)
131
11
(ii)
155
13
(iii)
151
13
(iv)
153
13
(v)
35
3
Question
6
6.
Given the mean of
10
samples as
6
1
10
,
what is the new mean if two samples
4
and
2
are added ?
(i)
11
2
(ii)
65
12
(iii)
23
4
(iv)
67
12
(v)
57
10
Question
7
7.
Given the mean of
12
samples as
5
1
4
,
what is the new mean if two samples
1
and
10
are removed ?
(i)
26
5
(ii)
24
5
(iii)
16
3
(iv)
36
7
(v)
28
5
Question
8
8.
Find the mean of all prime numbers between 20 and 80.
(i)
49
(ii)
53
(iii)
50
(iv)
52
(v)
51
Question
9
9.
Find the mean of all prime numbers between 40 and 70.
(i)
50
(ii)
54
(iii)
53
(iv)
56
(v)
52
Question
10
10.
Find the mean of first 5 multiples of 6.
(i)
20
(ii)
15
(iii)
18
(iv)
19
(v)
17
Question
11
11.
Find the mean of first 6 whole numbers.
(i)
9
4
(ii)
7
2
(iii)
3
(iv)
5
2
(v)
3
2
Question
12
12.
Find the mean of first 5 multiples of 12.
(i)
37
(ii)
35
(iii)
34
(iv)
39
(v)
36
Question
13
13.
Find the mean of the first 10 odd numbers.
(i)
11
(ii)
7
(iii)
13
(iv)
9
(v)
10
Question
14
14.
Find the mean of the first 15 even numbers.
(i)
16
(ii)
13
(iii)
17
(iv)
19
(v)
15
Question
15
15.
The marks obtained by 15 students in a test are given below. Find their mean marks.
16
10
26
39
5
2
26
23
16
49
34
33
41
27
43
(i)
27
(ii)
25
(iii)
24
(iv)
28
(v)
26
Question
16
16.
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 6.
46
20
10
20
29
18
39
27
40
9
25
31
14
14
(i)
153
5
(ii)
215
7
(iii)
91
3
(iv)
213
7
(v)
211
7
Question
17
17.
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 decreased by 2.
1
1
44
34
2
42
18
15
44
40
17
46
50
37
24
(i)
127
5
(ii)
77
3
(iii)
27
(iv)
79
3
(v)
25
Question
18
18.
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 doubled.
50
4
40
4
20
43
18
33
1
21
38
24
(i)
148
3
(ii)
50
(iii)
246
5
(iv)
146
3
Question
19
19.
Heights of 13 students (in cm) are given below. Find the mean height.
172
138
154
155
156
159
156
146
160
132
139
166
126
(i)
1960
13
cm
(ii)
1961
13
cm
(iii)
1985
13
cm
(iv)
1959
13
cm
(v)
1972
13
cm
Question
20
20.
Heights of 15 plants (in cm) are given below. Find the mean height.
92
80
91
54
75
63
95
52
76
81
83
70
60
71
100
(i)
382
5
cm
(ii)
383
5
cm
(iii)
391
5
cm
(iv)
386
5
cm
(v)
381
5
cm
Question
21
21.
Ages of 11 students (in years) are given below. Find the mean age.
13
10
15
13
13
12
10
13
10
14
10
(i)
155
11
years
(ii)
134
11
years
(iii)
135
11
years
(iv)
133
11
years
(v)
144
11
years
Question
22
22.
Rainfall of 11 days (in mm) are given below. Find the mean rainfall.
7
9
15
5
14
8
5
6
14
13
11
(i)
118
11
mm
(ii)
129
11
mm
(iii)
109
11
mm
(iv)
108
11
mm
(v)
107
11
mm
Question
23
23.
Temperatures of 10 days (in °C) are given below. Find the mean temperature.
35
30
28
34
34
32
27
30
34
29
(i)
157
5
°C
(ii)
313
10
°C
(iii)
63
2
°C
(iv)
323
10
°C
(v)
333
10
°C
Question
24
24.
Weights of 12 students (in kg) are given below. Find the mean weight.
43
43
48
48
43
52
60
58
59
54
58
54
(i)
158
3
kg
(ii)
155
3
kg
(iii)
157
3
kg
(iv)
161
3
kg
(v)
52
kg
Question
25
25.
Daily wages of 13 labourers (in ₹) are given below. Find the mean wage.
365
432
412
361
368
466
480
355
406
307
462
401
495
(i)
₹
409.46
(ii)
₹
410.46
(iii)
₹
408.62
(iv)
₹
408.46
(v)
₹
408.54
Question
26
26.
If the mean of
4
samples is
23
1
2
,
what is the new mean if
4
is added to each number.
(i)
28
(ii)
55
2
(iii)
109
4
(iv)
57
2
(v)
53
2
Question
27
27.
If the mean of
5
samples is
31
2
5
,
what is the new mean if
7
is subtracted from each number.
(i)
74
3
(ii)
24
(iii)
122
5
(iv)
170
7
(v)
124
5
Question
28
28.
If the mean of
8
samples is
32
3
8
,
what is the new mean if each number is multiplied by
10
.
(i)
1295
4
(ii)
1293
4
(iii)
649
2
(iv)
1297
4
(v)
647
2
Question
29
29.
The mean of
6
numbers is
12
5
6
.
Upon
adding
one number,
the mean becomes
11
4
7
.
Find the
included
number.
(i)
3
(ii)
5
(iii)
4
(iv)
6
(v)
1
Question
30
30.
Scores of 10 students are given below. Find the mean score.
81
77
74
89
77
88
88
88
75
78
(i)
163
2
(ii)
167
2
(iii)
165
2
(iv)
82
Question
31
31.
The mean of
7
numbers is
11
6
7
.
Upon
excluding
one number,
the mean becomes
10
2
3
.
Find the
excluded
number.
(i)
18
(ii)
17
(iii)
22
(iv)
20
(v)
19
Assignment Key
1) (iii)
2) (iii)
3) (i)
4) (iv)
5) (iv)
6) (iv)
7) (i)
8) (v)
9) (iii)
10) (iii)
11) (iv)
12) (v)
13) (v)
14) (i)
15) (v)
16) (iv)
17) (ii)
18) (i)
19) (iv)
20) (v)
21) (iv)
22) (v)
23) (ii)
24) (ii)
25) (iv)
26) (ii)
27) (iii)
28) (i)
29) (iii)
30) (i)
31) (v)
