EduSahara™ Assignment
Name : Arithmetic Mean
Chapter : Frequency Distribution Tables and Graphs
Grade : SSC Grade VIII
License : Non Commercial Use
Question
1
1.
If the mean of
3
7
8
x
6
10
is
5
5
6
,
find the value of x.
(i)
2
(ii)
0
(iii)
-2
(iv)
3
(v)
1
Question
2
2.
The mean of the below random sample is
30
7
10
.
Find the missing quantity.
20
47
36
31
29
x
17
30
20
39
(i)
41
(ii)
38
(iii)
39
(iv)
35
(v)
37
Question
3
3.
Given the mean of
9
samples as
12
7
9
,
what is the mean if a sample value is
increased
by
19
?
(i)
162
11
(ii)
44
3
(iii)
106
7
(iv)
136
9
(v)
134
9
Question
4
4.
Given the mean of
8
samples as
9
1
4
,
what is the mean if a sample value is
decreased
by
13
?
(i)
63
8
(ii)
47
6
(iii)
59
8
(iv)
61
8
(v)
15
2
Question
5
5.
Given the mean of
10
samples as
4
7
10
,
what is the new mean if two samples
8
and
10
are added ?
(i)
11
2
(ii)
67
12
(iii)
65
12
(iv)
75
14
(v)
21
4
Question
6
6.
Given the mean of
12
samples as
6
7
12
,
what is the new mean if two samples
5
and
3
are removed ?
(i)
69
10
(ii)
85
12
(iii)
73
10
(iv)
71
10
(v)
57
8
Question
7
7.
Find the mean of all prime numbers between 10 and 70.
(i)
551
15
(ii)
183
5
(iii)
479
13
(iv)
553
15
(v)
623
17
Question
8
8.
Find the mean of all prime numbers between 10 and 70.
(i)
183
5
(ii)
551
15
(iii)
553
15
(iv)
479
13
(v)
623
17
Question
9
9.
Find the mean of first 6 multiples of 14.
(i)
52
(ii)
49
(iii)
46
(iv)
48
(v)
50
Question
10
10.
Find the mean of first 7 whole numbers.
(i)
4
(ii)
6
(iii)
2
(iv)
3
(v)
0
Question
11
11.
Find the mean of first 7 multiples of 11.
(i)
43
(ii)
45
(iii)
44
(iv)
47
(v)
41
Question
12
12.
Find the mean of the first 20 odd numbers.
(i)
21
(ii)
20
(iii)
19
(iv)
22
(v)
18
Question
13
13.
Find the mean of the first 10 even numbers.
(i)
14
(ii)
10
(iii)
12
(iv)
11
(v)
9
Question
14
14.
The marks obtained by 11 students in a test are given below. Find their mean marks.
20
36
40
11
42
21
6
33
22
21
43
(i)
295
11
(ii)
347
13
(iii)
27
(iv)
293
11
Question
15
15.
The marks obtained by 14 students in a test are given below. Find the mean of their marks when the marks of each student is increased by 1.
30
22
7
15
50
24
23
40
11
37
5
5
32
26
(i)
339
14
(ii)
49
2
(iii)
389
16
(iv)
293
12
(v)
341
14
Question
16
16.
The marks obtained by 12 students in a test are given below. Find the mean of their marks when the marks of each student is decreased by 5.
19
22
28
1
19
2
47
49
47
3
33
17
(i)
75
4
(ii)
263
14
(iii)
227
12
(iv)
229
12
(v)
191
10
Question
17
17.
The marks obtained by 12 students in a test are given below. Find the mean of their marks when the marks of each student is doubled.
20
34
37
7
1
19
10
33
29
45
35
36
(i)
53
(ii)
50
(iii)
51
(iv)
52
(v)
48
Question
18
18.
Heights of 14 students (in cm) are given below. Find the mean height.
143
164
132
133
142
131
135
134
163
138
171
163
154
172
(i)
2103
14
cm
(ii)
2075
14
cm
(iii)
2077
14
cm
(iv)
2089
14
cm
(v)
1038
7
cm
Question
19
19.
Heights of 14 plants (in cm) are given below. Find the mean height.
86
55
76
69
68
51
72
86
82
82
62
73
77
69
(i)
73
cm
(ii)
70
cm
(iii)
71
cm
(iv)
74
cm
(v)
72
cm
Question
20
20.
Ages of 11 students (in years) are given below. Find the mean age.
15
11
15
15
10
14
11
14
13
13
13
(i)
144
11
years
(ii)
145
11
years
(iii)
166
11
years
(iv)
146
11
years
(v)
155
11
years
Question
21
21.
Rainfall of 10 days (in mm) are given below. Find the mean rainfall.
14
9
7
11
7
14
11
14
15
8
(i)
10
mm
(ii)
11
mm
(iii)
13
mm
(iv)
9
mm
(v)
12
mm
Question
22
22.
Scores of 11 students are given below. Find the mean score.
88
85
89
89
83
77
79
89
70
82
78
(i)
931
11
(ii)
920
11
(iii)
911
11
(iv)
910
11
(v)
909
11
Question
23
23.
Temperatures of 11 days (in °C) are given below. Find the mean temperature.
27
35
30
30
26
34
25
28
28
34
30
(i)
349
11
°C
(ii)
338
11
°C
(iii)
327
11
°C
(iv)
328
11
°C
(v)
329
11
°C
Question
24
24.
Weights of 14 students (in kg) are given below. Find the mean weight.
41
44
59
45
40
47
41
57
46
41
53
43
53
54
(i)
334
7
kg
(ii)
339
7
kg
(iii)
333
7
kg
(iv)
346
7
kg
(v)
332
7
kg
Question
25
25.
Daily wages of 12 labourers (in ₹) are given below. Find the mean wage.
471
398
344
364
354
338
387
452
357
408
303
498
(i)
₹
390.00
(ii)
₹
390.50
(iii)
₹
391.50
(iv)
₹
389.50
Question
26
26.
If the mean of
4
samples is
28
3
4
,
what is the new mean if
5
is added to each number.
(i)
133
4
(ii)
69
2
(iii)
135
4
(iv)
67
2
(v)
137
4
Question
27
27.
If the mean of
5
samples is
22
,
what is the new mean if
7
is subtracted from each number.
(i)
14
(ii)
15
(iii)
18
(iv)
16
(v)
12
Question
28
28.
If the mean of
6
samples is
25
1
2
,
what is the new mean if each number is multiplied by
10
.
(i)
256
(ii)
255
(iii)
254
(iv)
253
(v)
258
Question
29
29.
The mean of
5
numbers is
15
1
5
.
Upon
excluding
one number,
the mean becomes
15
.
Find the
excluded
number.
(i)
17
(ii)
13
(iii)
19
(iv)
15
(v)
16
Question
30
30.
The mean of
6
numbers is
12
1
2
.
Upon
adding
one number,
the mean becomes
13
4
7
.
Find the
included
number.
(i)
19
(ii)
21
(iii)
20
(iv)
18
(v)
23
Question
31
31.
The scores obtained by 8 students in a test are given below. Find the mean score.
10
15
14
8
3
18
19
3
(i)
3
(ii)
19
(iii)
11
1
4
(iv)
16
(v)
12
Question
32
32.
The arithmetic mean of a + 2, a, and a - 2 is
(i)
a - 2
(ii)
a
(iii)
3a
(iv)
a + 2
Question
33
33.
The arithmetic mean of
28
39
12
38
5
10
is
(i)
23
(ii)
22
(iii)
20
(iv)
21
(v)
24
Assignment Key
1) (v)
2) (ii)
3) (v)
4) (iv)
5) (iii)
6) (iv)
7) (i)
8) (ii)
9) (ii)
10) (iv)
11) (iii)
12) (ii)
13) (iv)
14) (i)
15) (v)
16) (iii)
17) (iii)
18) (ii)
19) (v)
20) (i)
21) (ii)
22) (v)
23) (iii)
24) (v)
25) (iv)
26) (iii)
27) (ii)
28) (ii)
29) (v)
30) (iii)
31) (iii)
32) (ii)
33) (ii)
