EduSahara™ Worksheet
Name : Chapter Based Worksheet
Chapter : Average
Grade : ICSE Grade VII
License : Non Commercial Use
Question
1
1.
If the mean of
5
samples is
19
,
what is the new mean if each number is multiplied by
5
.
(i)
97
(ii)
93
(iii)
96
(iv)
94
(v)
95
Question
2
2.
If the mean of
4
samples is
20
1
2
,
what is the new mean if
10
is subtracted from each number.
(i)
41
4
(ii)
23
2
(iii)
11
(iv)
19
2
(v)
21
2
Question
3
3.
Given the mean of
10
samples as
8
7
10
,
what is the mean if a sample value is
increased
by
15
?
(i)
31
3
(ii)
71
7
(iii)
49
5
(iv)
53
5
(v)
51
5
Question
4
4.
Find the mean of the first 20 odd numbers.
(i)
20
(ii)
19
(iii)
18
(iv)
21
(v)
23
Question
5
5.
The mean of
6
numbers is
8
1
6
.
Upon
excluding
one number,
the mean becomes
7
2
5
.
Find the
excluded
number.
(i)
13
(ii)
9
(iii)
11
(iv)
15
(v)
12
Question
6
6.
Temperatures of 25 days are given below. Find the mean.
Temperature (in degree C)
25
26
27
29
30
31
32
33
34
35
No. of days
4
3
1
3
3
3
2
2
3
1
(i)
743
25
°C
(ii)
767
25
°C
(iii)
792
25
°C
(iv)
744
25
°C
(v)
742
25
°C
Question
7
7.
The mean of
10
numbers is
11
7
10
.
Upon
excluding
one number,
the mean becomes
11
7
9
.
Find the
excluded
number.
(i)
12
(ii)
11
(iii)
8
(iv)
14
(v)
10
Question
8
8.
Find the mean of all prime numbers between 30 and 90.
(i)
417
7
(ii)
419
7
(iii)
299
5
(iv)
415
7
(v)
535
9
Question
9
9.
Given the mean of
12
samples as
9
5
12
,
what is the mean if a sample value is
decreased
by
20
?
(i)
31
4
(ii)
33
4
(iii)
29
4
(iv)
17
2
(v)
15
2
Question
10
10.
If the mean of
7
samples is
23
2
7
,
what is the new mean if each number is multiplied by
10
.
(i)
1628
7
(ii)
698
3
(iii)
1166
5
(iv)
1630
7
(v)
1632
7
Question
11
11.
Find the mean of the first 10 even numbers.
(i)
12
(ii)
10
(iii)
14
(iv)
8
(v)
11
Question
12
12.
Find the mean of all prime numbers between 20 and 60.
(i)
119
3
(ii)
201
5
(iii)
121
3
(iv)
41
Question
13
13.
If the mean of
7
samples is
38
5
7
,
what is the new mean if
4
is subtracted from each number.
(i)
35
(ii)
243
7
(iii)
241
7
(iv)
311
9
Question
14
14.
Find the mean of all prime numbers between 40 and 60.
(i)
339
7
(ii)
241
5
(iii)
49
(iv)
243
5
Question
15
15.
The arithmetic mean of
39
30
12
10
46
22
is
(i)
25.5
(ii)
28.5
(iii)
26.5
(iv)
24.5
(v)
27.5
Question
16
16.
The mean of
8
numbers is
11
1
4
.
Upon
adding
one number,
the mean becomes
10
2
3
.
Find the
included
number.
(i)
6
(ii)
7
(iii)
4
(iv)
8
(v)
5
Question
17
17.
Find the mean of first 7 whole numbers.
(i)
6
(ii)
3
(iii)
2
(iv)
4
(v)
0
Question
18
18.
Given the mean of
12
samples as
5
1
2
,
what is the new mean if two samples
2
and
3
are removed ?
(i)
61
10
(ii)
63
10
(iii)
59
10
(iv)
73
12
(v)
49
8
Question
19
19.
If the mean of
6
samples is
27
2
3
,
what is the new mean if
7
is added to each number.
(i)
36
(ii)
172
5
(iii)
34
(iv)
106
3
(v)
104
3
Question
20
20.
The mean of
8
numbers is
12
3
8
.
Upon
adding
one number,
the mean becomes
12
1
9
.
Find the
included
number.
(i)
9
(ii)
12
(iii)
10
(iv)
7
(v)
11
Question
21
21.
Find the mean of first 9 whole numbers.
(i)
4
(ii)
6
(iii)
3
(iv)
5
(v)
2
Question
22
22.
Given the mean of
10
samples as
5
1
2
,
what is the new mean if two samples
3
and
1
are added ?
(i)
19
4
(ii)
67
14
(iii)
61
12
(iv)
59
12
(v)
51
10
Question
23
23.
Find the mean of first 10 multiples of 20.
(i)
110
(ii)
109
(iii)
112
(iv)
111
(v)
107
Question
24
24.
Find the mean of the first 10 odd numbers.
(i)
8
(ii)
11
(iii)
9
(iv)
12
(v)
10
Question
25
25.
Find the mean of first 5 multiples of 6.
(i)
17
(ii)
18
(iii)
15
(iv)
20
(v)
19
Assignment Key
1) (v)
2) (v)
3) (v)
4) (i)
5) (v)
6) (v)
7) (ii)
8) (i)
9) (i)
10) (iv)
11) (v)
12) (iii)
13) (ii)
14) (iv)
15) (iii)
16) (i)
17) (ii)
18) (i)
19) (v)
20) (iii)
21) (i)
22) (iv)
23) (i)
24) (v)
25) (ii)
