EduSahara™ Assignment
Name : Average
Chapter : Average
Grade : ICSE Grade VII
License : Non Commercial Use
Question
1
1.
The arithmetic mean of
39
13
3
23
44
is
(i)
23.4
(ii)
22.4
(iii)
25.4
(iv)
26.4
(v)
24.4
Question
2
2.
If the mean of
5
samples is
32
4
5
,
what is the new mean if
8
is added to each number.
(i)
202
5
(ii)
284
7
(iii)
206
5
(iv)
204
5
(v)
124
3
Question
3
3.
If the mean of
7
samples is
22
4
7
,
what is the new mean if
9
is subtracted from each number.
(i)
95
7
(ii)
97
7
(iii)
93
7
(iv)
69
5
(v)
121
9
Question
4
4.
If the mean of
6
samples is
17
2
3
,
what is the new mean if each number is multiplied by
7
.
(i)
123
(ii)
373
3
(iii)
617
5
(iv)
125
(v)
371
3
Question
5
5.
The mean of
9
numbers is
11
5
9
.
Upon
excluding
one number,
the mean becomes
11
5
8
.
Find the
excluded
number.
(i)
12
(ii)
14
(iii)
11
(iv)
8
(v)
10
Question
6
6.
The mean of
5
numbers is
8
2
5
.
Upon
adding
one number,
the mean becomes
8
.
Find the
included
number.
(i)
3
(ii)
9
(iii)
7
(iv)
5
(v)
6
Question
7
7.
Temperatures of 30 days are given below. Find the mean.
Temperature (in degree C)
25
27
28
31
32
33
34
35
No. of days
5
5
3
7
3
4
1
2
(i)
149
5
°C
(ii)
893
30
°C
(iii)
953
30
°C
(iv)
179
6
°C
(v)
923
30
°C
Question
8
8.
Given the mean of
14
samples as
11
1
7
,
what is the mean if a sample value is
increased
by
20
?
(i)
64
5
(ii)
90
7
(iii)
86
7
(iv)
88
7
(v)
112
9
Question
9
9.
Given the mean of
6
samples as
10
1
6
,
what is the mean if a sample value is
decreased
by
12
?
(i)
65
8
(ii)
17
2
(iii)
33
4
(iv)
49
6
(v)
47
6
Question
10
10.
Given the mean of
10
samples as
5
1
2
,
what is the new mean if two samples
2
and
3
are added ?
(i)
6
(ii)
2
(iii)
4
(iv)
7
(v)
5
Question
11
11.
Given the mean of
12
samples as
5
1
2
,
what is the new mean if two samples
2
and
9
are removed ?
(i)
6
(ii)
21
4
(iii)
11
2
(iv)
9
2
(v)
13
2
Question
12
12.
Find the mean of all prime numbers between 40 and 70.
(i)
52
(ii)
53
(iii)
54
(iv)
51
(v)
55
Question
13
13.
Find the mean of all prime numbers between 10 and 70.
(i)
183
5
(ii)
479
13
(iii)
553
15
(iv)
551
15
(v)
623
17
Question
14
14.
Find the mean of first 9 multiples of 13.
(i)
66
(ii)
68
(iii)
65
(iv)
64
(v)
62
Question
15
15.
Find the mean of first 5 whole numbers.
(i)
1
(ii)
3
(iii)
5
(iv)
0
(v)
2
Question
16
16.
Find the mean of first 10 multiples of 18.
(i)
102
(ii)
99
(iii)
96
(iv)
100
(v)
98
Question
17
17.
Find the mean of the first 15 odd numbers.
(i)
16
(ii)
15
(iii)
17
(iv)
12
(v)
14
Question
18
18.
Find the mean of the first 20 even numbers.
(i)
20
(ii)
18
(iii)
21
(iv)
22
(v)
24
Assignment Key
1) (v)
2) (iv)
3) (i)
4) (v)
5) (iii)
6) (v)
7) (ii)
8) (iv)
9) (iv)
10) (v)
11) (iii)
12) (ii)
13) (iv)
14) (iii)
15) (v)
16) (ii)
17) (ii)
18) (iii)
