EduSahara™ Worksheet
Name : Chapter Based Worksheet
Chapter : Average
Grade : ICSE Grade VII
License : Non Commercial Use
Question
1
1.
Find the mean of all prime numbers between 30 and 60.
(i)
311
7
(ii)
309
7
(iii)
133
3
(iv)
313
7
(v)
223
5
Question
2
2.
Find the mean of the first 20 odd numbers.
(i)
19
(ii)
20
(iii)
17
(iv)
22
(v)
21
Question
3
3.
If the mean of
8
samples is
20
5
8
,
what is the new mean if
9
is subtracted from each number.
(i)
93
8
(ii)
71
6
(iii)
91
8
(iv)
95
8
(v)
23
2
Question
4
4.
Find the mean of all prime numbers between 20 and 100.
(i)
985
17
(ii)
869
15
(iii)
983
17
(iv)
981
17
(v)
1097
19
Question
5
5.
The arithmetic mean of
33
14
8
29
15
is
(i)
20.8
(ii)
19.8
(iii)
21.8
(iv)
17.8
(v)
18.8
Question
6
6.
Find the mean of the first 15 even numbers.
(i)
16
(ii)
14
(iii)
15
(iv)
17
(v)
19
Question
7
7.
Given the mean of
10
samples as
5
2
5
,
what is the new mean if two samples
4
and
6
are added ?
(i)
6
(ii)
26
5
(iii)
14
3
(iv)
16
3
Question
8
8.
The arithmetic mean of
32
11
45
33
17
is
(i)
25.6
(ii)
29.6
(iii)
26.6
(iv)
28.6
(v)
27.6
Question
9
9.
Given the mean of
6
samples as
8
1
2
,
what is the mean if a sample value is
decreased
by
17
?
(i)
27
5
(ii)
17
3
(iii)
19
3
(iv)
7
(v)
5
Question
10
10.
If the mean of
4
samples is
23
1
4
,
what is the new mean if each number is multiplied by
10
.
(i)
467
2
(ii)
463
2
(iii)
233
(iv)
929
4
(v)
465
2
Question
11
11.
If the mean of
6
samples is
36
1
6
,
what is the new mean if each number is multiplied by
5
.
(i)
1445
8
(ii)
1085
6
(iii)
361
2
(iv)
725
4
(v)
1087
6
Question
12
12.
Find the mean of first 8 whole numbers.
(i)
5
2
(ii)
4
(iii)
9
2
(iv)
13
4
(v)
7
2
Question
13
13.
Given the mean of
12
samples as
5
11
12
,
what is the new mean if two samples
2
and
1
are removed ?
(i)
46
7
(ii)
36
5
(iii)
32
5
(iv)
34
5
(v)
22
3
Question
14
14.
The mean of
5
numbers is
11
.
Upon
excluding
one number,
the mean becomes
10
.
Find the
excluded
number.
(i)
18
(ii)
16
(iii)
15
(iv)
12
(v)
14
Question
15
15.
Given the mean of
14
samples as
10
2
7
,
what is the mean if a sample value is
decreased
by
15
?
(i)
147
16
(ii)
129
14
(iii)
131
14
(iv)
37
4
(v)
127
14
Question
16
16.
If the mean of
4
samples is
27
3
4
,
what is the new mean if
4
is added to each number.
(i)
127
4
(ii)
63
2
(iii)
125
4
(iv)
65
2
(v)
129
4
Question
17
17.
Find the mean of all prime numbers between 50 and 80.
(i)
465
7
(ii)
331
5
(iii)
461
7
(iv)
595
9
(v)
463
7
Question
18
18.
Find the mean of all prime numbers between 40 and 70.
(i)
54
(ii)
51
(iii)
53
(iv)
52
(v)
56
Question
19
19.
The mean of
8
numbers is
8
3
4
.
Upon
adding
one number,
the mean becomes
8
7
9
.
Find the
included
number.
(i)
9
(ii)
11
(iii)
8
(iv)
7
(v)
10
Question
20
20.
Find the mean of first 6 multiples of 9.
(i)
65
2
(ii)
32
(iii)
63
2
(iv)
61
2
(v)
125
4
Question
21
21.
Given the mean of
11
samples as
13
1
11
,
what is the mean if a sample value is
increased
by
17
?
(i)
133
9
(ii)
163
11
(iii)
189
13
(iv)
161
11
(v)
159
11
Question
22
22.
The mean of
10
numbers is
8
3
10
.
Upon
adding
one number,
the mean becomes
8
7
11
.
Find the
included
number.
(i)
14
(ii)
9
(iii)
13
(iv)
12
(v)
11
Question
23
23.
Temperatures of 15 days are given below. Find the mean.
Temperature (in degree C)
25
27
28
29
31
32
33
No. of days
1
1
2
3
1
2
5
(i)
91
3
°C
(ii)
92
3
°C
(iii)
97
3
°C
(iv)
94
3
°C
(v)
31
°C
Question
24
24.
Find the mean of first 8 multiples of 9.
(i)
81
2
(ii)
79
2
(iii)
41
(iv)
161
4
(v)
83
2
Question
25
25.
Find the mean of first 6 multiples of 5.
(i)
33
2
(ii)
37
2
(iii)
18
(iv)
69
4
(v)
35
2
Assignment Key
1) (i)
2) (ii)
3) (i)
4) (iii)
5) (ii)
6) (i)
7) (iv)
8) (v)
9) (ii)
10) (v)
11) (ii)
12) (v)
13) (iv)
14) (iii)
15) (ii)
16) (i)
17) (v)
18) (iii)
19) (i)
20) (iii)
21) (iv)
22) (iv)
23) (i)
24) (i)
25) (v)
