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.
17
19
10
2
20
7
14
15
4
2
20
19
(i)
18
(ii)
20
(iii)
12
5
12
(iv)
2
(v)
14
1
2
Question
2
2.
If the mean of
1
9
2
x
6
10
4
is
5
4
7
,
find the value of x.
(i)
4
(ii)
6
(iii)
8
(iv)
10
(v)
7
Question
3
3.
The mean of the below random sample is
35
4
5
.
Find the missing quantity.
18
33
49
14
33
46
17
48
x
50
(i)
53
(ii)
50
(iii)
51
(iv)
48
(v)
49
Question
4
4.
Given the mean of
11
samples as
12
10
11
,
what is the mean if a sample value is
increased
by
19
?
(i)
133
9
(ii)
161
11
(iii)
163
11
(iv)
159
11
(v)
189
13
Question
5
5.
Given the mean of
12
samples as
10
1
2
,
what is the mean if a sample value is
decreased
by
11
?
(i)
115
12
(ii)
19
2
(iii)
113
12
(iv)
39
4
(v)
97
10
Question
6
6.
Given the mean of
10
samples as
5
1
10
,
what is the new mean if two samples
1
and
3
are added ?
(i)
47
10
(ii)
53
12
(iii)
9
2
(iv)
55
12
(v)
19
4
Question
7
7.
Given the mean of
12
samples as
5
1
4
,
what is the new mean if two samples
8
and
10
are removed ?
(i)
9
2
(ii)
17
4
(iii)
7
2
(iv)
11
2
(v)
5
Question
8
8.
Find the mean of all prime numbers between 10 and 80.
(i)
42
(ii)
41
(iii)
45
(iv)
43
(v)
44
Question
9
9.
Find the mean of all prime numbers between 50 and 70.
(i)
59
(ii)
61
(iii)
60
(iv)
62
(v)
57
Question
10
10.
Find the mean of first 7 multiples of 4.
(i)
18
(ii)
14
(iii)
17
(iv)
15
(v)
16
Question
11
11.
Find the mean of first 10 whole numbers.
(i)
5
(ii)
17
4
(iii)
11
2
(iv)
9
2
(v)
7
2
Question
12
12.
Find the mean of first 6 multiples of 15.
(i)
103
2
(ii)
53
(iii)
107
2
(iv)
105
2
(v)
209
4
Question
13
13.
Find the mean of the first 15 odd numbers.
(i)
14
(ii)
12
(iii)
16
(iv)
18
(v)
15
Question
14
14.
Find the mean of the first 15 even numbers.
(i)
13
(ii)
15
(iii)
19
(iv)
17
(v)
16
Question
15
15.
The marks obtained by 12 students in a test are given below. Find their mean marks.
26
47
3
28
20
32
23
38
46
30
29
25
(i)
347
12
(ii)
403
14
(iii)
349
12
(iv)
115
4
(v)
291
10
Question
16
16.
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 increased by 9.
45
36
21
14
25
25
8
19
20
15
22
35
24
(i)
428
13
(ii)
424
13
(iii)
426
13
(iv)
98
3
(v)
362
11
Question
17
17.
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 decreased by 4.
13
43
38
47
46
26
18
40
31
40
(i)
211
7
(ii)
91
3
(iii)
153
5
(iv)
149
5
(v)
151
5
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.
8
14
35
32
45
28
28
43
39
34
16
22
3
27
(i)
376
7
(ii)
372
7
(iii)
268
5
(iv)
160
3
(v)
374
7
Question
19
19.
Heights of 15 students (in cm) are given below. Find the mean height.
151
169
126
144
136
171
138
168
134
172
175
172
150
133
126
(i)
150
cm
(ii)
149
cm
(iii)
151
cm
(iv)
153
cm
(v)
152
cm
Question
20
20.
Heights of 10 plants (in cm) are given below. Find the mean height.
86
68
94
80
90
64
93
90
100
84
(i)
851
10
cm
(ii)
859
10
cm
(iii)
869
10
cm
(iv)
85
cm
(v)
849
10
cm
Question
21
21.
Ages of 10 students (in years) are given below. Find the mean age.
15
15
15
15
11
13
11
15
10
11
(i)
141
10
years
(ii)
131
10
years
(iii)
151
10
years
(iv)
66
5
years
(v)
133
10
years
Question
22
22.
Rainfall of 15 days (in mm) are given below. Find the mean rainfall.
5
12
12
8
7
14
14
14
5
14
6
10
8
5
10
(i)
53
5
mm
(ii)
49
5
mm
(iii)
48
5
mm
(iv)
58
5
mm
(v)
10
mm
Question
23
23.
Temperatures of 12 days (in °C) are given below. Find the mean temperature.
35
32
28
30
31
34
35
27
33
30
29
34
(i)
67
2
°C
(ii)
32
°C
(iii)
63
2
°C
(iv)
65
2
°C
Question
24
24.
Weights of 12 students (in kg) are given below. Find the mean weight.
47
40
59
45
51
48
56
59
59
45
56
41
(i)
51
kg
(ii)
101
2
kg
(iii)
105
2
kg
(iv)
103
2
kg
Question
25
25.
Daily wages of 12 labourers (in ₹) are given below. Find the mean wage.
464
471
462
467
484
353
407
324
335
343
399
371
(i)
₹
407.67
(ii)
₹
406.67
(iii)
₹
408.67
(iv)
₹
407.00
(v)
₹
407.33
Question
26
26.
If the mean of
5
samples is
27
2
5
,
what is the new mean if
9
is added to each number.
(i)
110
3
(ii)
36
(iii)
182
5
(iv)
254
7
(v)
184
5
Question
27
27.
If the mean of
8
samples is
26
1
4
,
what is the new mean if
5
is subtracted from each number.
(i)
127
6
(ii)
83
4
(iii)
85
4
(iv)
43
2
(v)
87
4
Question
28
28.
If the mean of
8
samples is
27
1
2
,
what is the new mean if each number is multiplied by
10
.
(i)
273
(ii)
274
(iii)
275
(iv)
276
(v)
278
Question
29
29.
The mean of
7
numbers is
7
.
Upon
adding
one number,
the mean becomes
8
.
Find the
included
number.
(i)
12
(ii)
18
(iii)
15
(iv)
14
(v)
16
Question
30
30.
Scores of 14 students are given below. Find the mean score.
77
81
74
78
87
72
87
84
90
87
87
76
71
81
(i)
568
7
(ii)
81
(iii)
580
7
(iv)
573
7
(v)
566
7
Question
31
31.
The mean of
10
numbers is
12
3
10
.
Upon
excluding
one number,
the mean becomes
13
2
9
.
Find the
excluded
number.
(i)
2
(ii)
5
(iii)
3
(iv)
4
(v)
6
Assignment Key
1) (iii)
2) (v)
3) (ii)
4) (ii)
5) (i)
6) (iv)
7) (i)
8) (iv)
9) (iii)
10) (v)
11) (iv)
12) (iv)
13) (v)
14) (v)
15) (i)
16) (iii)
17) (v)
18) (v)
19) (iii)
20) (v)
21) (ii)
22) (iii)
23) (iii)
24) (ii)
25) (ii)
26) (iii)
27) (iii)
28) (iii)
29) (iii)
30) (v)
31) (iv)
