EduSahara™ Worksheet
Name : Chapter Based Worksheet
Chapter : Average
Grade : ICSE Grade VII
License : Non Commercial Use
Question
1
1.
The mean of
5
numbers is
10
4
5
.
Upon
excluding
one number,
the mean becomes
12
1
2
.
Find the
excluded
number.
(i)
3
(ii)
5
(iii)
1
(iv)
6
(v)
4
Question
2
2.
Find the mean of the first 15 even numbers.
(i)
19
(ii)
15
(iii)
16
(iv)
13
(v)
17
Question
3
3.
Given the mean of
10
samples as
5
7
10
,
what is the new mean if two samples
2
and
2
are added ?
(i)
61
12
(ii)
59
12
(iii)
71
14
(iv)
51
10
(v)
21
4
Question
4
4.
Given the mean of
12
samples as
5
1
6
,
what is the new mean if two samples
9
and
6
are removed ?
(i)
49
10
(ii)
47
10
(iii)
9
2
(iv)
39
8
(v)
55
12
Question
5
5.
Find the mean of first 5 whole numbers.
(i)
2
(ii)
1
(iii)
3
(iv)
5
(v)
-1
Question
6
6.
If the mean of
6
samples is
21
2
3
,
what is the new mean if
4
is added to each number.
(i)
27
(ii)
79
3
(iii)
25
(iv)
77
3
(v)
127
5
Question
7
7.
Find the mean of all prime numbers between 40 and 100.
(i)
731
11
(ii)
863
13
(iii)
199
3
(iv)
861
13
(v)
865
13
Question
8
8.
Find the mean of all prime numbers between 40 and 90.
(i)
257
4
(ii)
127
2
(iii)
385
6
(iv)
383
6
(v)
509
8
Question
9
9.
If the mean of
8
samples is
20
,
what is the new mean if each number is multiplied by
10
.
(i)
200
(ii)
201
(iii)
202
(iv)
199
(v)
197
Question
10
10.
Find the mean of first 5 whole numbers.
(i)
1
(ii)
0
(iii)
2
(iv)
4
(v)
3
Question
11
11.
Find the mean of first 8 multiples of 3.
(i)
53
4
(ii)
25
2
(iii)
27
2
(iv)
29
2
(v)
14
Question
12
12.
Given the mean of
10
samples as
5
3
5
,
what is the new mean if two samples
10
and
7
are added ?
(i)
71
12
(ii)
85
14
(iii)
73
12
(iv)
61
10
(v)
25
4
Question
13
13.
Find the mean of first 8 multiples of 14.
(i)
62
(ii)
65
(iii)
64
(iv)
63
(v)
60
Question
14
14.
If the mean of
6
samples is
19
1
6
,
what is the new mean if
6
is subtracted from each number.
(i)
53
4
(ii)
79
6
(iii)
27
2
(iv)
77
6
(v)
105
8
Question
15
15.
The mean of
10
numbers is
12
1
10
.
Upon
adding
one number,
the mean becomes
12
7
11
.
Find the
included
number.
(i)
17
(ii)
21
(iii)
18
(iv)
15
(v)
19
Question
16
16.
The mean of
7
numbers is
8
3
7
.
Upon
adding
one number,
the mean becomes
9
1
8
.
Find the
included
number.
(i)
15
(ii)
12
(iii)
16
(iv)
13
(v)
14
Question
17
17.
Find the mean of all prime numbers between 30 and 60.
(i)
133
3
(ii)
223
5
(iii)
309
7
(iv)
313
7
(v)
311
7
Question
18
18.
Temperatures of 30 days are given below. Find the mean.
Temperature (in degree C)
25
27
28
29
30
31
32
33
34
35
No. of days
7
3
3
3
3
1
3
1
1
5
(i)
148
5
°C
(ii)
89
3
°C
(iii)
458
15
°C
(iv)
443
15
°C
(v)
473
15
°C
Question
19
19.
Given the mean of
15
samples as
6
2
5
,
what is the mean if a sample value is
decreased
by
12
?
(i)
38
7
(ii)
6
(iii)
28
5
(iv)
26
5
Question
20
20.
The mean of
10
numbers is
8
1
5
.
Upon
excluding
one number,
the mean becomes
9
.
Find the
excluded
number.
(i)
0
(ii)
-2
(iii)
1
(iv)
4
(v)
2
Question
21
21.
Find the mean of first 8 multiples of 6.
(i)
27
(ii)
26
(iii)
25
(iv)
29
(v)
28
Question
22
22.
Given the mean of
12
samples as
6
1
6
,
what is the new mean if two samples
8
and
10
are removed ?
(i)
28
5
(ii)
6
(iii)
26
5
(iv)
38
7
Question
23
23.
Given the mean of
8
samples as
10
3
4
,
what is the mean if a sample value is
increased
by
13
?
(i)
123
10
(ii)
101
8
(iii)
99
8
(iv)
97
8
(v)
25
2
Question
24
24.
Find the mean of the first 10 odd numbers.
(i)
12
(ii)
7
(iii)
10
(iv)
9
(v)
11
Question
25
25.
The arithmetic mean of
46
2
30
28
17
17
is
(i)
25.33
(ii)
22.33
(iii)
21.33
(iv)
24.33
(v)
23.33
Assignment Key
1) (v)
2) (iii)
3) (i)
4) (ii)
5) (i)
6) (iv)
7) (ii)
8) (iv)
9) (i)
10) (iii)
11) (iii)
12) (iii)
13) (iv)
14) (ii)
15) (iii)
16) (v)
17) (v)
18) (iv)
19) (iii)
20) (iii)
21) (i)
22) (i)
23) (iii)
24) (iii)
25) (v)
