EduSahara™ Worksheet
Name : Chapter Based Worksheet
Chapter : Average
Grade : ICSE Grade VII
License : Non Commercial Use
Question
1
1.
Given the mean of
12
samples as
12
11
12
,
what is the mean if a sample value is
decreased
by
18
?
(i)
139
12
(ii)
137
12
(iii)
159
14
(iv)
45
4
(v)
23
2
Question
2
2.
Find the mean of the first 10 even numbers.
(i)
13
(ii)
12
(iii)
11
(iv)
9
(v)
10
Question
3
3.
If the mean of
6
samples is
27
1
3
,
what is the new mean if each number is multiplied by
8
.
(i)
220
(ii)
218
(iii)
656
3
(iv)
658
3
(v)
1092
5
Question
4
4.
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
5
5.
Find the mean of first 7 whole numbers.
(i)
4
(ii)
1
(iii)
2
(iv)
5
(v)
3
Question
6
6.
Find the mean of first 8 multiples of 11.
(i)
99
2
(ii)
101
2
(iii)
97
2
(iv)
197
4
(v)
50
Question
7
7.
Find the mean of first 10 multiples of 14.
(i)
77
(ii)
76
(iii)
74
(iv)
78
(v)
79
Question
8
8.
Find the mean of first 10 multiples of 9.
(i)
99
2
(ii)
101
2
(iii)
197
4
(iv)
97
2
(v)
50
Question
9
9.
If the mean of
4
samples is
22
1
4
,
what is the new mean if each number is multiplied by
10
.
(i)
447
2
(ii)
443
2
(iii)
223
(iv)
889
4
(v)
445
2
Question
10
10.
Find the mean of all prime numbers between 50 and 70.
(i)
58
(ii)
59
(iii)
60
(iv)
62
(v)
61
Question
11
11.
Given the mean of
12
samples as
12
,
what is the mean if a sample value is
decreased
by
15
?
(i)
41
4
(ii)
21
2
(iii)
43
4
(iv)
45
4
(v)
23
2
Question
12
12.
Given the mean of
12
samples as
6
1
4
,
what is the new mean if two samples
6
and
6
are removed ?
(i)
51
8
(ii)
13
2
(iii)
25
4
(iv)
61
10
(v)
63
10
Question
13
13.
Temperatures of 20 days are given below. Find the mean.
Temperature (in degree C)
25
26
27
28
30
31
33
34
No. of days
2
2
3
3
3
5
1
1
(i)
579
20
°C
(ii)
619
20
°C
(iii)
29
°C
(iv)
599
20
°C
(v)
581
20
°C
Question
14
14.
Given the mean of
11
samples as
9
7
11
,
what is the mean if a sample value is
increased
by
13
?
(i)
119
11
(ii)
139
13
(iii)
117
11
(iv)
11
Question
15
15.
Given the mean of
10
samples as
6
1
10
,
what is the new mean if two samples
6
and
7
are added ?
(i)
49
8
(ii)
25
4
(iii)
37
6
(iv)
35
6
(v)
13
2
Question
16
16.
If the mean of
7
samples is
29
5
7
,
what is the new mean if
3
is added to each number.
(i)
33
(ii)
293
9
(iii)
229
7
(iv)
227
7
Question
17
17.
Given the mean of
12
samples as
11
1
2
,
what is the mean if a sample value is
increased
by
16
?
(i)
77
6
(ii)
79
6
(iii)
101
8
(iv)
25
2
(v)
53
4
Question
18
18.
If the mean of
5
samples is
20
1
5
,
what is the new mean if
10
is subtracted from each number.
(i)
49
5
(ii)
71
7
(iii)
31
3
(iv)
51
5
(v)
53
5
Question
19
19.
The mean of
9
numbers is
11
8
9
.
Upon
excluding
one number,
the mean becomes
10
7
8
.
Find the
excluded
number.
(i)
19
(ii)
18
(iii)
20
(iv)
23
(v)
21
Question
20
20.
The arithmetic mean of
43
8
31
16
1
40
19
is
(i)
23.57
(ii)
20.57
(iii)
22.57
(iv)
21.57
(v)
24.57
Question
21
21.
Find the mean of all prime numbers between 30 and 60.
(i)
223
5
(ii)
311
7
(iii)
309
7
(iv)
313
7
(v)
133
3
Question
22
22.
Find the mean of all prime numbers between 40 and 70.
(i)
51
(ii)
52
(iii)
53
(iv)
54
(v)
55
Question
23
23.
The arithmetic mean of
48
18
25
8
49
29
is
(i)
31.5
(ii)
29.5
(iii)
28.5
(iv)
30.5
(v)
27.5
Question
24
24.
The mean of
6
numbers is
9
2
3
.
Upon
adding
one number,
the mean becomes
10
.
Find the
included
number.
(i)
14
(ii)
12
(iii)
13
(iv)
11
(v)
9
Question
25
25.
Find the mean of the first 15 odd numbers.
(i)
14
(ii)
15
(iii)
13
(iv)
16
(v)
17
Assignment Key
1) (ii)
2) (iii)
3) (iii)
4) (iv)
5) (v)
6) (i)
7) (i)
8) (i)
9) (v)
10) (iii)
11) (iii)
12) (v)
13) (i)
14) (i)
15) (iii)
16) (iii)
17) (i)
18) (iv)
19) (iii)
20) (iii)
21) (ii)
22) (iii)
23) (ii)
24) (ii)
25) (ii)
