EduSahara™ Assignment
Name : Arithmetic Mean
Chapter : Data Handling
Grade : SSC Grade VII
License : Non Commercial Use
Question
1
1.
The scores obtained by 6 students in a test are given below. Find the mean score.
13
7
14
3
12
4
(i)
9
1
2
(ii)
3
(iii)
11
(iv)
14
(v)
8
5
6
Question
2
2.
Find the mean of all prime numbers between 10 and 70.
(i)
623
17
(ii)
183
5
(iii)
553
15
(iv)
551
15
(v)
479
13
Question
3
3.
Find the mean of all prime numbers between 30 and 100.
(i)
931
15
(ii)
311
5
(iii)
929
15
(iv)
1055
17
(v)
807
13
Question
4
4.
Find the mean of first 9 multiples of 9.
(i)
46
(ii)
42
(iii)
44
(iv)
45
(v)
48
Question
5
5.
Find the mean of first 10 whole numbers.
(i)
7
2
(ii)
5
(iii)
17
4
(iv)
9
2
(v)
11
2
Question
6
6.
Find the mean of first 5 multiples of 5.
(i)
14
(ii)
17
(iii)
15
(iv)
13
(v)
16
Question
7
7.
Find the mean of the first 20 odd numbers.
(i)
20
(ii)
23
(iii)
21
(iv)
17
(v)
19
Question
8
8.
Find the mean of the first 20 even numbers.
(i)
20
(ii)
21
(iii)
24
(iv)
18
(v)
22
Question
9
9.
The marks obtained by 12 students in a test are given below. Find their mean marks.
23
26
1
23
31
11
9
30
23
19
29
42
(i)
45
2
(ii)
133
6
(iii)
91
4
(iv)
87
4
(v)
89
4
Question
10
10.
The marks obtained by 15 students in a test are given below. Find the mean of their marks when the marks of each student is increased by 8.
29
35
7
21
41
34
37
9
14
44
49
31
25
16
8
(i)
104
3
(ii)
34
(iii)
172
5
(iv)
36
(v)
106
3
Question
11
11.
The marks obtained by 10 students in a test are given below. Find the mean of their marks when the marks of each student is decreased by 4.
34
32
50
22
50
10
24
28
6
14
(i)
23
(ii)
24
(iii)
21
(iv)
22
(v)
25
Question
12
12.
The marks obtained by 13 students in a test are given below. Find the mean of their marks when the marks of each student is doubled.
28
32
49
37
8
23
18
37
4
49
5
9
29
(i)
654
13
(ii)
252
5
(iii)
656
13
(iv)
556
11
(v)
658
13
Question
13
13.
Heights of 12 students (in cm) are given below. Find the mean height.
138
175
151
164
170
139
132
151
136
168
134
143
(i)
1813
12
cm
(ii)
601
4
cm
(iii)
1801
12
cm
(iv)
901
6
cm
(v)
1825
12
cm
Question
14
14.
Heights of 11 plants (in cm) are given below. Find the mean height.
75
94
84
91
72
58
95
99
66
56
75
(i)
876
11
cm
(ii)
866
11
cm
(iii)
867
11
cm
(iv)
865
11
cm
(v)
887
11
cm
Question
15
15.
Ages of 10 students (in years) are given below. Find the mean age.
10
11
13
14
13
15
14
13
15
15
(i)
27
2
years
(ii)
67
5
years
(iii)
133
10
years
(iv)
153
10
years
(v)
143
10
years
Question
16
16.
Rainfall of 15 days (in mm) are given below. Find the mean rainfall.
9
12
6
14
14
7
15
12
6
12
14
10
13
12
7
(i)
11
mm
(ii)
163
15
mm
(iii)
164
15
mm
(iv)
178
15
mm
(v)
193
15
mm
Question
17
17.
Scores of 13 students are given below. Find the mean score.
85
81
84
80
85
89
87
89
72
80
72
78
82
(i)
1065
13
(ii)
1077
13
(iii)
1090
13
(iv)
1064
13
(v)
82
Question
18
18.
Temperatures of 14 days (in °C) are given below. Find the mean temperature.
32
34
27
29
27
30
28
35
30
26
32
32
25
28
(i)
208
7
°C
(ii)
429
14
°C
(iii)
415
14
°C
(iv)
443
14
°C
(v)
417
14
°C
Question
19
19.
Weights of 12 students (in kg) are given below. Find the mean weight.
45
42
54
46
41
44
43
48
58
42
41
58
(i)
293
6
kg
(ii)
287
6
kg
(iii)
283
6
kg
(iv)
47
kg
(v)
281
6
kg
Question
20
20.
Daily wages of 10 labourers (in ₹) are given below. Find the mean wage.
345
418
348
379
354
395
303
492
411
489
(i)
₹
395.40
(ii)
₹
394.40
(iii)
₹
393.60
(iv)
₹
393.40
(v)
₹
393.80
Question
21
21.
If the mean of
10
7
3
1
x
4
6
9
is
5
1
4
,
find the value of x.
(i)
3
(ii)
0
(iii)
2
(iv)
1
(v)
4
Question
22
22.
The mean of the below random sample is
31
2
5
.
Find the missing quantity.
x
10
43
41
49
45
35
21
27
23
(i)
18
(ii)
21
(iii)
23
(iv)
20
(v)
19
Question
23
23.
Given the mean of
6
samples as
12
,
what is the mean if a sample value is
increased
by
13
?
(i)
57
4
(ii)
29
2
(iii)
83
6
(iv)
113
8
(v)
85
6
Question
24
24.
Given the mean of
9
samples as
5
8
9
,
what is the mean if a sample value is
decreased
by
16
?
(i)
13
3
(ii)
45
11
(iii)
37
9
(iv)
29
7
(v)
35
9
Question
25
25.
Given the mean of
10
samples as
5
2
5
,
what is the new mean if two samples
1
and
10
are added ?
(i)
75
14
(ii)
21
4
(iii)
11
2
(iv)
67
12
(v)
65
12
Question
26
26.
Given the mean of
12
samples as
7
11
12
,
what is the new mean if two samples
10
and
7
are removed ?
(i)
39
5
(ii)
37
5
(iii)
53
7
(iv)
25
3
(v)
41
5
Question
27
27.
The arithmetic mean of a + 2, a, and a - 2 is
(i)
a
(ii)
a - 2
(iii)
3a
(iv)
a + 2
Question
28
28.
The arithmetic mean of
10
26
46
41
48
is
(i)
32.2
(ii)
34.2
(iii)
33.2
(iv)
35.2
(v)
36.2
Question
29
29.
If the mean of
8
samples is
29
7
8
,
what is the new mean if
4
is added to each number.
(i)
271
8
(ii)
337
10
(iii)
273
8
(iv)
205
6
(v)
269
8
Question
30
30.
If the mean of
7
samples is
32
2
7
,
what is the new mean if
5
is subtracted from each number.
(i)
245
9
(ii)
193
7
(iii)
27
(iv)
137
5
(v)
191
7
Question
31
31.
If the mean of
5
samples is
15
,
what is the new mean if each number is multiplied by
3
.
(i)
43
(ii)
45
(iii)
48
(iv)
46
(v)
44
Question
32
32.
The mean of
6
numbers is
9
1
2
.
Upon
excluding
one number,
the mean becomes
10
3
5
.
Find the
excluded
number.
(i)
6
(ii)
4
(iii)
3
(iv)
5
(v)
1
Question
33
33.
The mean of
5
numbers is
10
.
Upon
adding
one number,
the mean becomes
9
1
3
.
Find the
included
number.
(i)
8
(ii)
7
(iii)
3
(iv)
5
(v)
6
Assignment Key
1) (v)
2) (iv)
3) (i)
4) (iv)
5) (iv)
6) (iii)
7) (i)
8) (ii)
9) (v)
10) (i)
11) (i)
12) (iii)
13) (iii)
14) (iv)
15) (iii)
16) (ii)
17) (iv)
18) (iii)
19) (v)
20) (iv)
21) (iii)
22) (iv)
23) (v)
24) (iii)
25) (v)
26) (i)
27) (i)
28) (ii)
29) (i)
30) (v)
31) (ii)
32) (ii)
33) (v)
