EduSahara™ Worksheet
Name : Chapter Based Worksheet
Chapter : Average
Grade : ICSE Grade VII
License : Non Commercial Use
Question
1
1.
Find the mean of the first 20 odd numbers.
(i)
18
(ii)
21
(iii)
20
(iv)
19
(v)
23
Question
2
2.
Find the mean of the first 20 even numbers.
(i)
23
(ii)
22
(iii)
19
(iv)
21
(v)
20
Question
3
3.
Find the mean of first 7 multiples of 2.
(i)
6
(ii)
9
(iii)
10
(iv)
8
(v)
7
Question
4
4.
If the mean of
5
samples is
37
1
5
,
what is the new mean if
7
is subtracted from each number.
(i)
211
7
(ii)
149
5
(iii)
91
3
(iv)
151
5
(v)
153
5
Question
5
5.
The arithmetic mean of
45
9
44
45
45
18
is
(i)
33.33
(ii)
36.33
(iii)
32.33
(iv)
35.33
(v)
34.33
Question
6
6.
Given the mean of
11
samples as
11
7
11
,
what is the mean if a sample value is
increased
by
11
?
(i)
141
11
(ii)
115
9
(iii)
163
13
(iv)
137
11
(v)
139
11
Question
7
7.
The mean of
6
numbers is
11
5
6
.
Upon
adding
one number,
the mean becomes
13
.
Find the
included
number.
(i)
23
(ii)
21
(iii)
20
(iv)
17
(v)
19
Question
8
8.
The mean of
10
numbers is
10
4
5
.
Upon
excluding
one number,
the mean becomes
10
2
3
.
Find the
excluded
number.
(i)
13
(ii)
10
(iii)
12
(iv)
15
(v)
11
Question
9
9.
Find the mean of first 5 multiples of 15.
(i)
48
(ii)
44
(iii)
46
(iv)
42
(v)
45
Question
10
10.
Find the mean of all prime numbers between 50 and 60.
(i)
58
(ii)
55
(iii)
53
(iv)
56
(v)
57
Question
11
11.
Given the mean of
10
samples as
5
,
what is the new mean if two samples
4
and
3
are added ?
(i)
11
2
(ii)
21
4
(iii)
9
2
(iv)
19
4
(v)
17
4
Question
12
12.
If the mean of
8
samples is
28
3
8
,
what is the new mean if
5
is added to each number.
(i)
269
8
(ii)
67
2
(iii)
265
8
(iv)
333
10
(v)
267
8
Question
13
13.
If the mean of
4
samples is
22
1
4
,
what is the new mean if each number is multiplied by
5
.
(i)
447
4
(ii)
443
4
(iii)
223
2
(iv)
445
4
(v)
667
6
Question
14
14.
Given the mean of
10
samples as
5
3
10
,
what is the new mean if two samples
8
and
1
are added ?
(i)
11
2
(ii)
21
4
(iii)
41
8
(iv)
29
6
(v)
31
6
Question
15
15.
Find the mean of all prime numbers between 40 and 80.
(i)
59
(ii)
415
7
(iii)
297
5
(iv)
299
5
(v)
179
3
Question
16
16.
Find the mean of first 10 whole numbers.
(i)
5
(ii)
11
2
(iii)
17
4
(iv)
7
2
(v)
9
2
Question
17
17.
Given the mean of
8
samples as
9
1
8
,
what is the mean if a sample value is
decreased
by
11
?
(i)
17
2
(ii)
29
4
(iii)
31
4
(iv)
33
4
(v)
15
2
Question
18
18.
Temperatures of 30 days are given below. Find the mean.
Temperature (in degree C)
25
26
27
28
29
30
35
No. of days
5
6
2
6
5
3
3
(i)
283
10
°C
(ii)
281
10
°C
(iii)
141
5
°C
(iv)
291
10
°C
(v)
301
10
°C
Question
19
19.
Find the mean of first 10 multiples of 13.
(i)
145
2
(ii)
141
2
(iii)
143
2
(iv)
285
4
(v)
72
Question
20
20.
Find the mean of the first 15 even numbers.
(i)
15
(ii)
17
(iii)
16
(iv)
13
(v)
19
Question
21
21.
If the mean of
4
samples is
22
,
what is the new mean if
7
is added to each number.
(i)
30
(ii)
29
(iii)
31
(iv)
27
(v)
28
Question
22
22.
Given the mean of
14
samples as
10
3
7
,
what is the mean if a sample value is
increased
by
16
?
(i)
83
7
(ii)
79
7
(iii)
103
9
(iv)
81
7
(v)
59
5
Question
23
23.
Find the mean of first 10 multiples of 2.
(i)
9
(ii)
14
(iii)
12
(iv)
11
(v)
10
Question
24
24.
Given the mean of
6
samples as
8
1
3
,
what is the mean if a sample value is
decreased
by
14
?
(i)
9
(ii)
5
(iii)
3
(iv)
7
(v)
6
Question
25
25.
Given the mean of
12
samples as
5
1
6
,
what is the new mean if two samples
4
and
2
are removed ?
(i)
26
5
(ii)
28
5
(iii)
6
(iv)
38
7
Assignment Key
1) (iii)
2) (iv)
3) (iv)
4) (iv)
5) (v)
6) (v)
7) (iii)
8) (iii)
9) (v)
10) (iv)
11) (iv)
12) (v)
13) (iv)
14) (v)
15) (iii)
16) (v)
17) (iii)
18) (ii)
19) (iii)
20) (iii)
21) (ii)
22) (iv)
23) (iv)
24) (v)
25) (ii)
