EduSahara™ Assignment
Name : Average
Chapter : Average
Grade : ICSE Grade VII
License : Non Commercial Use
Question
1
1.
The arithmetic mean of
43
31
47
8
44
is
(i)
36.6
(ii)
33.6
(iii)
34.6
(iv)
35.6
(v)
32.6
Question
2
2.
If the mean of
8
samples is
25
3
4
,
what is the new mean if
4
is added to each number.
(i)
117
4
(ii)
59
2
(iii)
121
4
(iv)
61
2
(v)
119
4
Question
3
3.
If the mean of
7
samples is
20
1
7
,
what is the new mean if
4
is subtracted from each number.
(i)
81
5
(ii)
113
7
(iii)
111
7
(iv)
145
9
(v)
115
7
Question
4
4.
If the mean of
6
samples is
23
1
2
,
what is the new mean if each number is multiplied by
4
.
(i)
95
(ii)
93
(iii)
96
(iv)
94
(v)
91
Question
5
5.
The mean of
7
numbers is
13
1
7
.
Upon
excluding
one number,
the mean becomes
12
2
3
.
Find the
excluded
number.
(i)
16
(ii)
17
(iii)
18
(iv)
14
(v)
15
Question
6
6.
The mean of
9
numbers is
7
8
9
.
Upon
adding
one number,
the mean becomes
8
4
5
.
Find the
included
number.
(i)
14
(ii)
17
(iii)
16
(iv)
18
(v)
20
Question
7
7.
Temperatures of 30 days are given below. Find the mean.
Temperature (in degree C)
25
26
27
28
29
30
31
32
33
35
No. of days
4
6
4
2
2
1
1
4
5
1
(i)
29
°C
(ii)
299
10
°C
(iii)
309
10
°C
(iv)
289
10
°C
(v)
291
10
°C
Question
8
8.
Given the mean of
10
samples as
12
4
5
,
what is the mean if a sample value is
increased
by
13
?
(i)
143
10
(ii)
169
12
(iii)
113
8
(iv)
139
10
(v)
141
10
Question
9
9.
Given the mean of
12
samples as
8
2
3
,
what is the mean if a sample value is
decreased
by
15
?
(i)
89
12
(ii)
29
4
(iii)
15
2
(iv)
91
12
(v)
103
14
Question
10
10.
Given the mean of
10
samples as
5
3
5
,
what is the new mean if two samples
3
and
8
are added ?
(i)
11
2
(ii)
23
4
(iii)
57
10
(iv)
67
12
(v)
65
12
Question
11
11.
Given the mean of
12
samples as
6
1
3
,
what is the new mean if two samples
3
and
5
are removed ?
(i)
46
7
(ii)
32
5
(iii)
34
5
(iv)
22
3
(v)
36
5
Question
12
12.
Find the mean of all prime numbers between 20 and 90.
(i)
443
8
(ii)
441
8
(iii)
445
8
(iv)
553
10
(v)
111
2
Question
13
13.
Find the mean of all prime numbers between 50 and 60.
(i)
59
(ii)
54
(iii)
56
(iv)
57
(v)
55
Question
14
14.
Find the mean of first 7 multiples of 12.
(i)
48
(ii)
51
(iii)
49
(iv)
45
(v)
47
Question
15
15.
Find the mean of first 8 whole numbers.
(i)
4
(ii)
13
4
(iii)
7
2
(iv)
9
2
(v)
5
2
Question
16
16.
Find the mean of first 5 multiples of 2.
(i)
7
(ii)
3
(iii)
6
(iv)
9
(v)
5
Question
17
17.
Find the mean of the first 20 odd numbers.
(i)
17
(ii)
19
(iii)
21
(iv)
20
(v)
22
Question
18
18.
Find the mean of the first 20 even numbers.
(i)
19
(ii)
20
(iii)
24
(iv)
21
(v)
22
Assignment Key
1) (iii)
2) (v)
3) (ii)
4) (iv)
5) (i)
6) (ii)
7) (iv)
8) (v)
9) (i)
10) (iv)
11) (iii)
12) (i)
13) (iii)
14) (i)
15) (iii)
16) (iii)
17) (iv)
18) (iv)
