EduSahara™ Assignment
Name : Average
Chapter : Average
Grade : ICSE Grade VII
License : Non Commercial Use
Question
1
1.
The arithmetic mean of
38
28
34
31
23
is
(i)
31.8
(ii)
30.8
(iii)
29.8
(iv)
28.8
(v)
32.8
Question
2
2.
If the mean of
6
samples is
24
1
6
,
what is the new mean if
6
is added to each number.
(i)
241
8
(ii)
121
4
(iii)
61
2
(iv)
179
6
(v)
181
6
Question
3
3.
If the mean of
8
samples is
19
,
what is the new mean if
9
is subtracted from each number.
(i)
8
(ii)
9
(iii)
12
(iv)
10
(v)
11
Question
4
4.
If the mean of
6
samples is
28
,
what is the new mean if each number is multiplied by
4
.
(i)
113
(ii)
110
(iii)
114
(iv)
112
(v)
111
Question
5
5.
The mean of
10
numbers is
9
2
5
.
Upon
excluding
one number,
the mean becomes
10
1
3
.
Find the
excluded
number.
(i)
4
(ii)
-1
(iii)
2
(iv)
0
(v)
1
Question
6
6.
The mean of
5
numbers is
15
1
5
.
Upon
adding
one number,
the mean becomes
13
5
6
.
Find the
included
number.
(i)
8
(ii)
7
(iii)
6
(iv)
4
(v)
10
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
34
35
No. of days
1
3
2
3
7
4
2
5
1
2
(i)
30
°C
(ii)
95
3
°C
(iii)
89
3
°C
(iv)
92
3
°C
(v)
91
3
°C
Question
8
8.
Given the mean of
14
samples as
10
2
7
,
what is the mean if a sample value is
increased
by
17
?
(i)
25
2
(ii)
23
2
(iii)
21
2
(iv)
45
4
(v)
12
Question
9
9.
Given the mean of
9
samples as
11
2
3
,
what is the mean if a sample value is
decreased
by
18
?
(i)
31
3
(ii)
29
3
(iii)
11
(iv)
9
(v)
47
5
Question
10
10.
Given the mean of
10
samples as
5
1
2
,
what is the new mean if two samples
10
and
4
are added ?
(i)
23
4
(ii)
11
2
(iii)
25
4
(iv)
21
4
(v)
13
2
Question
11
11.
Given the mean of
12
samples as
6
,
what is the new mean if two samples
2
and
5
are removed ?
(i)
25
4
(ii)
13
2
(iii)
11
2
(iv)
15
2
(v)
7
Question
12
12.
Find the mean of all prime numbers between 10 and 90.
(i)
95
2
(ii)
473
10
(iii)
379
8
(iv)
189
4
(v)
471
10
Question
13
13.
Find the mean of all prime numbers between 10 and 80.
(i)
43
(ii)
46
(iii)
40
(iv)
44
(v)
42
Question
14
14.
Find the mean of first 8 multiples of 14.
(i)
62
(ii)
64
(iii)
60
(iv)
65
(v)
63
Question
15
15.
Find the mean of first 6 whole numbers.
(i)
3
2
(ii)
3
(iii)
7
2
(iv)
9
4
(v)
5
2
Question
16
16.
Find the mean of first 9 multiples of 19.
(i)
94
(ii)
95
(iii)
98
(iv)
96
(v)
93
Question
17
17.
Find the mean of the first 20 odd numbers.
(i)
17
(ii)
20
(iii)
22
(iv)
21
(v)
19
Question
18
18.
Find the mean of the first 20 even numbers.
(i)
21
(ii)
22
(iii)
24
(iv)
18
(v)
20
Assignment Key
1) (ii)
2) (v)
3) (iv)
4) (iv)
5) (v)
6) (ii)
7) (iii)
8) (ii)
9) (ii)
10) (i)
11) (ii)
12) (ii)
13) (i)
14) (v)
15) (v)
16) (ii)
17) (ii)
18) (i)
