EduSahara™ Assignment
Name : Mean of Raw Data
Chapter : Statistics
Grade : ICSE Grade VIII
License : Non Commercial Use
Question
1
1.
The scores obtained by 8 students in a test are given below. Find the mean score.
16
8
14
16
1
4
3
3
(i)
6
(ii)
15
(iii)
3
(iv)
16
(v)
8
1
8
Question
2
2.
If the mean of
7
6
2
x
4
9
8
is
5
6
7
,
find the value of x.
(i)
5
(ii)
8
(iii)
4
(iv)
6
(v)
3
Question
3
3.
The mean of the below random sample is
30
2
5
.
Find the missing quantity.
x
36
30
25
27
25
26
44
31
30
(i)
33
(ii)
31
(iii)
30
(iv)
29
(v)
27
Question
4
4.
Given the mean of
8
samples as
10
5
8
,
what is the mean if a sample value is
increased
by
19
?
(i)
12
(ii)
13
(iii)
11
(iv)
14
(v)
15
Question
5
5.
Given the mean of
15
samples as
10
4
5
,
what is the mean if a sample value is
decreased
by
18
?
(i)
66
7
(ii)
48
5
(iii)
46
5
(iv)
10
Question
6
6.
Given the mean of
10
samples as
4
2
5
,
what is the new mean if two samples
1
and
6
are added ?
(i)
25
6
(ii)
15
4
(iii)
17
4
(iv)
9
2
(v)
19
4
Question
7
7.
Given the mean of
12
samples as
6
5
6
,
what is the new mean if two samples
8
and
7
are removed ?
(i)
79
12
(ii)
13
2
(iii)
69
10
(iv)
55
8
(v)
67
10
Question
8
8.
Find the mean of all prime numbers between 10 and 70.
(i)
183
5
(ii)
551
15
(iii)
479
13
(iv)
553
15
(v)
623
17
Question
9
9.
Find the mean of all prime numbers between 30 and 100.
(i)
931
15
(ii)
311
5
(iii)
807
13
(iv)
1055
17
(v)
929
15
Question
10
10.
Find the mean of first 7 multiples of 8.
(i)
29
(ii)
35
(iii)
33
(iv)
32
(v)
31
Question
11
11.
Find the mean of first 5 whole numbers.
(i)
1
(ii)
2
(iii)
3
(iv)
5
(v)
-1
Question
12
12.
Find the mean of first 8 multiples of 9.
(i)
161
4
(ii)
41
(iii)
83
2
(iv)
81
2
(v)
79
2
Question
13
13.
Find the mean of the first 15 odd numbers.
(i)
16
(ii)
18
(iii)
13
(iv)
14
(v)
15
Question
14
14.
Find the mean of the first 10 even numbers.
(i)
10
(ii)
12
(iii)
9
(iv)
11
(v)
13
Question
15
15.
The marks obtained by 14 students in a test are given below. Find their mean marks.
3
30
32
26
41
3
28
14
10
25
4
48
47
1
(i)
200
9
(ii)
158
7
(iii)
156
7
(iv)
112
5
(v)
22
Question
16
16.
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 10.
22
33
36
39
24
45
14
29
18
49
50
41
(i)
130
3
(ii)
44
(iii)
216
5
(iv)
128
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 2.
20
4
32
33
16
31
49
31
36
10
11
(i)
251
11
(ii)
249
11
(iii)
23
(iv)
295
13
Question
18
18.
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 doubled.
34
43
13
4
43
36
37
35
49
42
38
(i)
69
(ii)
66
(iii)
68
(iv)
70
(v)
67
Question
19
19.
Heights of 11 students (in cm) are given below. Find the mean height.
167
142
174
136
158
129
165
148
127
129
134
(i)
1631
11
cm
(ii)
1620
11
cm
(iii)
1611
11
cm
(iv)
1610
11
cm
(v)
1609
11
cm
Question
20
20.
Heights of 15 plants (in cm) are given below. Find the mean height.
55
76
84
83
55
100
79
74
100
54
71
98
66
68
91
(i)
1156
15
cm
(ii)
1169
15
cm
(iii)
1184
15
cm
(iv)
1154
15
cm
(v)
77
cm
Question
21
21.
Ages of 12 students (in years) are given below. Find the mean age.
13
10
13
12
12
12
13
14
11
14
13
12
(i)
25
2
years
(ii)
151
12
years
(iii)
161
12
years
(iv)
149
12
years
(v)
173
12
years
Question
22
22.
Rainfall of 14 days (in mm) are given below. Find the mean rainfall.
13
14
15
9
7
9
12
7
6
13
9
13
12
12
(i)
151
14
mm
(ii)
179
14
mm
(iii)
165
14
mm
(iv)
153
14
mm
(v)
76
7
mm
Question
23
23.
Scores of 11 students are given below. Find the mean score.
76
83
85
79
84
88
88
70
85
90
90
(i)
929
11
(ii)
918
11
(iii)
940
11
(iv)
920
11
(v)
919
11
Question
24
24.
Temperatures of 14 days (in °C) are given below. Find the mean temperature.
27
29
31
28
33
32
29
28
25
26
28
35
28
30
(i)
409
14
°C
(ii)
437
14
°C
(iii)
423
14
°C
(iv)
411
14
°C
(v)
205
7
°C
Question
25
25.
Weights of 12 students (in kg) are given below. Find the mean weight.
52
60
57
44
56
56
42
40
40
54
51
57
(i)
203
4
kg
(ii)
211
4
kg
(iii)
207
4
kg
(iv)
51
kg
(v)
205
4
kg
Question
26
26.
Daily wages of 11 labourers (in ₹) are given below. Find the mean wage.
316
451
442
500
445
491
316
364
367
500
412
(i)
₹
418.55
(ii)
₹
418.73
(iii)
₹
418.64
(iv)
₹
420.55
(v)
₹
419.55
Question
27
27.
The arithmetic mean of
15
43
4
10
27
22
38
11
is
(i)
20.25
(ii)
22.25
(iii)
19.25
(iv)
23.25
(v)
21.25
Question
28
28.
The arithmetic mean of a + 2, a, and a - 2 is
(i)
a
(ii)
a - 2
(iii)
3a
(iv)
a + 2
Question
29
29.
If the mean of
4
samples is
28
3
4
,
what is the new mean if
9
is added to each number.
(i)
149
4
(ii)
151
4
(iii)
77
2
(iv)
153
4
(v)
75
2
Question
30
30.
If the mean of
5
samples is
17
1
5
,
what is the new mean if
5
is subtracted from each number.
(i)
59
5
(ii)
63
5
(iii)
37
3
(iv)
61
5
(v)
85
7
Question
31
31.
If the mean of
5
samples is
26
2
5
,
what is the new mean if each number is multiplied by
7
.
(i)
926
5
(ii)
922
5
(iii)
924
5
(iv)
556
3
(v)
1292
7
Question
32
32.
The mean of
9
numbers is
8
2
3
.
Upon
excluding
one number,
the mean becomes
7
1
2
.
Find the
excluded
number.
(i)
20
(ii)
18
(iii)
19
(iv)
17
(v)
16
Question
33
33.
The mean of
6
numbers is
12
2
3
.
Upon
adding
one number,
the mean becomes
13
1
7
.
Find the
included
number.
(i)
17
(ii)
19
(iii)
13
(iv)
15
(v)
16
Assignment Key
1) (v)
2) (i)
3) (iii)
4) (ii)
5) (ii)
6) (iii)
7) (v)
8) (ii)
9) (i)
10) (iv)
11) (ii)
12) (iv)
13) (v)
14) (iv)
15) (iii)
16) (i)
17) (i)
18) (iii)
19) (v)
20) (iv)
21) (iv)
22) (i)
23) (ii)
24) (i)
25) (i)
26) (i)
27) (v)
28) (i)
29) (ii)
30) (iv)
31) (iii)
32) (ii)
33) (v)
