EduSahara™ Worksheet
Name : Chapter Based Worksheet
Chapter : Average
Grade : ICSE Grade VII
License : Non Commercial Use
Question
1
1.
The mean of
6
numbers is
11
5
6
.
Upon
adding
one number,
the mean becomes
12
4
7
.
Find the
included
number.
(i)
19
(ii)
17
(iii)
14
(iv)
16
(v)
18
Question
2
2.
The mean of
6
numbers is
7
1
6
.
Upon
excluding
one number,
the mean becomes
8
.
Find the
excluded
number.
(i)
5
(ii)
3
(iii)
2
(iv)
1
(v)
4
Question
3
3.
Temperatures of 25 days are given below. Find the mean.
Temperature (in degree C)
25
28
29
30
31
33
34
35
No. of days
5
2
6
2
2
2
3
3
(i)
30
°C
(ii)
28
°C
(iii)
32
°C
(iv)
31
°C
(v)
29
°C
Question
4
4.
Given the mean of
7
samples as
12
2
7
,
what is the mean if a sample value is
decreased
by
11
?
(i)
95
9
(ii)
75
7
(iii)
11
(iv)
73
7
Question
5
5.
Given the mean of
11
samples as
9
10
11
,
what is the mean if a sample value is
increased
by
11
?
(i)
122
11
(ii)
100
9
(iii)
140
13
(iv)
120
11
(v)
118
11
Question
6
6.
If the mean of
8
samples is
31
3
8
,
what is the new mean if each number is multiplied by
6
.
(i)
377
2
(ii)
755
4
(iii)
753
4
(iv)
751
4
(v)
1129
6
Question
7
7.
The mean of
10
numbers is
10
2
5
.
Upon
adding
one number,
the mean becomes
10
9
11
.
Find the
included
number.
(i)
14
(ii)
16
(iii)
13
(iv)
15
(v)
18
Question
8
8.
Find the mean of first 5 multiples of 8.
(i)
23
(ii)
25
(iii)
24
(iv)
21
(v)
26
Question
9
9.
Find the mean of first 7 multiples of 16.
(i)
67
(ii)
62
(iii)
63
(iv)
65
(v)
64
Question
10
10.
Given the mean of
12
samples as
6
1
2
,
what is the new mean if two samples
9
and
7
are removed ?
(i)
19
3
(ii)
29
5
(iii)
33
5
(iv)
43
7
(v)
31
5
Question
11
11.
If the mean of
8
samples is
24
,
what is the new mean if
9
is subtracted from each number.
(i)
16
(ii)
12
(iii)
14
(iv)
18
(v)
15
Question
12
12.
If the mean of
5
samples is
36
3
5
,
what is the new mean if
5
is added to each number.
(i)
206
5
(ii)
208
5
(iii)
290
7
(iv)
42
Question
13
13.
Find the mean of the first 15 even numbers.
(i)
14
(ii)
18
(iii)
15
(iv)
17
(v)
16
Question
14
14.
Find the mean of the first 20 odd numbers.
(i)
19
(ii)
22
(iii)
18
(iv)
20
(v)
21
Question
15
15.
Given the mean of
10
samples as
6
3
10
,
what is the new mean if two samples
9
and
5
are added ?
(i)
79
12
(ii)
25
4
(iii)
13
2
(iv)
77
12
(v)
89
14
Question
16
16.
Find the mean of all prime numbers between 20 and 60.
(i)
121
3
(ii)
119
3
(iii)
201
5
(iv)
41
Question
17
17.
Find the mean of all prime numbers between 50 and 90.
(i)
635
9
(ii)
775
11
(iii)
211
3
(iv)
637
9
(v)
495
7
Question
18
18.
Find the mean of first 6 whole numbers.
(i)
7
2
(ii)
5
2
(iii)
3
(iv)
9
4
(v)
3
2
Question
19
19.
Given the mean of
12
samples as
4
5
12
,
what is the new mean if two samples
7
and
5
are removed ?
(i)
49
12
(ii)
43
10
(iii)
39
10
(iv)
33
8
(v)
41
10
Question
20
20.
If the mean of
6
samples is
17
1
2
,
what is the new mean if each number is multiplied by
9
.
(i)
158
(ii)
317
2
(iii)
313
2
(iv)
315
2
(v)
629
4
Question
21
21.
Find the mean of all prime numbers between 10 and 70.
(i)
551
15
(ii)
553
15
(iii)
479
13
(iv)
623
17
(v)
183
5
Question
22
22.
The arithmetic mean of
28
36
14
32
42
48
is
(i)
35.33
(ii)
32.33
(iii)
34.33
(iv)
31.33
(v)
33.33
Question
23
23.
Find the mean of first 7 whole numbers.
(i)
2
(ii)
3
(iii)
4
(iv)
1
(v)
5
Question
24
24.
Find the mean of the first 10 odd numbers.
(i)
13
(ii)
8
(iii)
10
(iv)
11
(v)
9
Question
25
25.
Temperatures of 30 days are given below. Find the mean.
Temperature (in degree C)
25
26
27
28
29
30
31
32
33
34
35
No. of days
2
3
3
3
7
1
5
1
2
2
1
(i)
148
5
°C
(ii)
152
5
°C
(iii)
147
5
°C
(iv)
157
5
°C
(v)
149
5
°C
Assignment Key
1) (ii)
2) (ii)
3) (i)
4) (ii)
5) (iv)
6) (iii)
7) (iv)
8) (iii)
9) (v)
10) (v)
11) (v)
12) (ii)
13) (v)
14) (iv)
15) (iv)
16) (i)
17) (i)
18) (ii)
19) (v)
20) (iv)
21) (i)
22) (v)
23) (ii)
24) (iii)
25) (iii)
