EduSahara™ Assignment
Name : Average
Chapter : Average
Grade : ICSE Grade VII
License : Non Commercial Use
Question
1
1.
The arithmetic mean of
36
46
42
14
39
1
is
(i)
30.67
(ii)
27.67
(iii)
29.67
(iv)
31.67
(v)
28.67
Question
2
2.
If the mean of
8
samples is
25
1
8
,
what is the new mean if
6
is added to each number.
(i)
311
10
(ii)
251
8
(iii)
247
8
(iv)
249
8
(v)
187
6
Question
3
3.
If the mean of
8
samples is
31
5
8
,
what is the new mean if
5
is subtracted from each number.
(i)
161
6
(ii)
211
8
(iii)
213
8
(iv)
215
8
(v)
53
2
Question
4
4.
If the mean of
5
samples is
18
2
5
,
what is the new mean if each number is multiplied by
8
.
(i)
734
5
(ii)
736
5
(iii)
1030
7
(iv)
738
5
(v)
442
3
Question
5
5.
The mean of
9
numbers is
8
1
9
.
Upon
excluding
one number,
the mean becomes
7
1
2
.
Find the
excluded
number.
(i)
13
(ii)
12
(iii)
14
(iv)
16
(v)
11
Question
6
6.
The mean of
5
numbers is
9
1
5
.
Upon
adding
one number,
the mean becomes
10
1
3
.
Find the
included
number.
(i)
17
(ii)
13
(iii)
16
(iv)
15
(v)
18
Question
7
7.
Temperatures of 25 days are given below. Find the mean.
Temperature (in degree C)
25
26
27
28
29
30
31
32
34
35
No. of days
3
1
1
4
2
3
2
2
3
4
(i)
806
25
°C
(ii)
756
25
°C
(iii)
758
25
°C
(iv)
757
25
°C
(v)
781
25
°C
Question
8
8.
Given the mean of
11
samples as
11
5
11
,
what is the mean if a sample value is
increased
by
18
?
(i)
142
11
(ii)
170
13
(iii)
144
11
(iv)
146
11
(v)
118
9
Question
9
9.
Given the mean of
10
samples as
7
4
5
,
what is the mean if a sample value is
decreased
by
16
?
(i)
33
5
(ii)
43
7
(iii)
19
3
(iv)
31
5
(v)
29
5
Question
10
10.
Given the mean of
10
samples as
4
1
10
,
what is the new mean if two samples
3
and
5
are added ?
(i)
17
4
(ii)
49
12
(iii)
57
14
(iv)
41
10
(v)
47
12
Question
11
11.
Given the mean of
12
samples as
5
1
2
,
what is the new mean if two samples
6
and
3
are removed ?
(i)
59
10
(ii)
67
12
(iii)
11
2
(iv)
47
8
(v)
57
10
Question
12
12.
Find the mean of all prime numbers between 20 and 90.
(i)
441
8
(ii)
443
8
(iii)
445
8
(iv)
111
2
(v)
553
10
Question
13
13.
Find the mean of all prime numbers between 30 and 90.
(i)
419
7
(ii)
417
7
(iii)
415
7
(iv)
299
5
(v)
535
9
Question
14
14.
Find the mean of first 6 multiples of 3.
(i)
41
4
(ii)
23
2
(iii)
11
(iv)
19
2
(v)
21
2
Question
15
15.
Find the mean of first 7 whole numbers.
(i)
4
(ii)
5
(iii)
2
(iv)
3
(v)
1
Question
16
16.
Find the mean of first 7 multiples of 12.
(i)
49
(ii)
46
(iii)
47
(iv)
51
(v)
48
Question
17
17.
Find the mean of the first 15 odd numbers.
(i)
14
(ii)
16
(iii)
18
(iv)
15
(v)
12
Question
18
18.
Find the mean of the first 20 even numbers.
(i)
20
(ii)
21
(iii)
19
(iv)
22
(v)
23
Assignment Key
1) (iii)
2) (iv)
3) (iii)
4) (ii)
5) (i)
6) (iii)
7) (ii)
8) (iii)
9) (iv)
10) (ii)
11) (v)
12) (ii)
13) (ii)
14) (v)
15) (iv)
16) (v)
17) (iv)
18) (ii)
