EduSahara™ Assignment
Name : Average
Chapter : Average
Grade : ICSE Grade VII
License : Non Commercial Use
Question
1
1.
The arithmetic mean of
34
33
32
46
15
11
49
13
is
(i)
27.12
(ii)
30.12
(iii)
29.12
(iv)
28.12
(v)
31.12
Question
2
2.
If the mean of
6
samples is
26
1
6
,
what is the new mean if
9
is added to each number.
(i)
141
4
(ii)
209
6
(iii)
71
2
(iv)
211
6
(v)
281
8
Question
3
3.
If the mean of
7
samples is
23
2
7
,
what is the new mean if
9
is subtracted from each number.
(i)
128
9
(ii)
100
7
(iii)
102
7
(iv)
14
(v)
72
5
Question
4
4.
If the mean of
7
samples is
29
5
7
,
what is the new mean if each number is multiplied by
7
.
(i)
208
(ii)
209
(iii)
206
(iv)
211
(v)
207
Question
5
5.
The mean of
8
numbers is
7
5
8
.
Upon
excluding
one number,
the mean becomes
7
6
7
.
Find the
excluded
number.
(i)
7
(ii)
3
(iii)
6
(iv)
5
(v)
8
Question
6
6.
The mean of
6
numbers is
12
1
3
.
Upon
adding
one number,
the mean becomes
11
6
7
.
Find the
included
number.
(i)
10
(ii)
11
(iii)
6
(iv)
9
(v)
8
Question
7
7.
Temperatures of 10 days are given below. Find the mean.
Temperature (in degree C)
25
28
30
31
33
34
No. of days
2
1
1
3
1
2
(i)
151
5
°C
(ii)
152
5
°C
(iii)
156
5
°C
(iv)
161
5
°C
(v)
153
5
°C
Question
8
8.
Given the mean of
15
samples as
10
1
5
,
what is the mean if a sample value is
increased
by
10
?
(i)
183
17
(ii)
11
(iii)
163
15
(iv)
161
15
Question
9
9.
Given the mean of
13
samples as
7
11
13
,
what is the mean if a sample value is
decreased
by
11
?
(i)
6
(ii)
9
(iii)
7
(iv)
5
(v)
8
Question
10
10.
Given the mean of
10
samples as
6
,
what is the new mean if two samples
3
and
7
are added ?
(i)
37
6
(ii)
11
2
(iii)
35
6
(iv)
45
8
(v)
25
4
Question
11
11.
Given the mean of
12
samples as
5
1
3
,
what is the new mean if two samples
10
and
4
are removed ?
(i)
8
(ii)
4
(iii)
6
(iv)
5
(v)
2
Question
12
12.
Find the mean of all prime numbers between 20 and 70.
(i)
489
11
(ii)
403
9
(iii)
491
11
(iv)
493
11
(v)
579
13
Question
13
13.
Find the mean of all prime numbers between 10 and 80.
(i)
45
(ii)
40
(iii)
42
(iv)
43
(v)
44
Question
14
14.
Find the mean of first 5 multiples of 11.
(i)
32
(ii)
33
(iii)
36
(iv)
30
(v)
34
Question
15
15.
Find the mean of first 10 whole numbers.
(i)
7
2
(ii)
5
(iii)
11
2
(iv)
17
4
(v)
9
2
Question
16
16.
Find the mean of first 7 multiples of 3.
(i)
12
(ii)
10
(iii)
11
(iv)
15
(v)
13
Question
17
17.
Find the mean of the first 10 odd numbers.
(i)
12
(ii)
10
(iii)
9
(iv)
8
(v)
11
Question
18
18.
Find the mean of the first 20 even numbers.
(i)
20
(ii)
18
(iii)
23
(iv)
22
(v)
21
Assignment Key
1) (iii)
2) (iv)
3) (ii)
4) (i)
5) (iii)
6) (iv)
7) (i)
8) (iii)
9) (iii)
10) (iii)
11) (iv)
12) (iii)
13) (iv)
14) (ii)
15) (v)
16) (i)
17) (ii)
18) (v)
