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
4
10
3
7
x
9
1
8
is
5
7
8
,
find the value of x.
(i)
6
(ii)
7
(iii)
5
(iv)
4
(v)
3
Question
2
2.
The mean of the below random sample is
22
7
10
.
Find the missing quantity.
13
29
16
45
11
20
12
10
31
x
(i)
41
(ii)
43
(iii)
40
(iv)
38
(v)
39
Question
3
3.
Given the mean of
14
samples as
10
2
7
,
what is the mean if a sample value is
increased
by
16
?
(i)
34
3
(ii)
82
7
(iii)
80
7
(iv)
58
5
(v)
78
7
Question
4
4.
Given the mean of
15
samples as
8
11
15
,
what is the mean if a sample value is
decreased
by
18
?
(i)
37
5
(ii)
127
17
(iii)
23
3
(iv)
113
15
(v)
99
13
Question
5
5.
Given the mean of
10
samples as
5
2
5
,
what is the new mean if two samples
5
and
4
are added ?
(i)
31
6
(ii)
19
4
(iii)
21
4
(iv)
11
2
(v)
23
4
Question
6
6.
Given the mean of
12
samples as
4
2
3
,
what is the new mean if two samples
5
and
2
are removed ?
(i)
47
10
(ii)
49
10
(iii)
41
8
(iv)
51
10
(v)
19
4
Question
7
7.
Find the mean of all prime numbers between 10 and 80.
(i)
41
(ii)
45
(iii)
43
(iv)
44
(v)
42
Question
8
8.
Find the mean of all prime numbers between 10 and 80.
(i)
41
(ii)
42
(iii)
43
(iv)
45
(v)
44
Question
9
9.
Find the mean of first 8 multiples of 4.
(i)
18
(ii)
16
(iii)
19
(iv)
21
(v)
17
Question
10
10.
Find the mean of first 7 whole numbers.
(i)
5
(ii)
2
(iii)
3
(iv)
4
(v)
0
Question
11
11.
Find the mean of first 8 multiples of 2.
(i)
10
(ii)
11
(iii)
9
(iv)
8
(v)
7
Question
12
12.
Find the mean of the first 10 odd numbers.
(i)
10
(ii)
13
(iii)
11
(iv)
9
(v)
7
Question
13
13.
Find the mean of the first 10 even numbers.
(i)
13
(ii)
10
(iii)
12
(iv)
11
(v)
9
Question
14
14.
The marks obtained by 14 students in a test are given below. Find their mean marks.
5
12
3
13
45
19
15
21
8
17
9
22
9
18
(i)
108
7
(ii)
106
7
(iii)
110
7
(iv)
78
5
(v)
46
3
Question
15
15.
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 increased by 10.
46
1
44
47
23
25
12
15
5
7
(i)
63
2
(ii)
65
2
(iii)
67
2
(iv)
129
4
(v)
33
Question
16
16.
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 decreased by 2.
7
4
33
7
43
15
13
7
35
32
26
38
7
46
(i)
245
12
(ii)
41
2
(iii)
285
14
(iv)
283
14
(v)
325
16
Question
17
17.
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.
3
50
33
29
44
13
48
2
45
18
30
6
34
(i)
712
13
(ii)
818
15
(iii)
602
11
(iv)
708
13
(v)
710
13
Question
18
18.
Heights of 13 students (in cm) are given below. Find the mean height.
137
171
160
175
171
149
140
131
163
143
165
128
155
(i)
1988
13
cm
(ii)
2001
13
cm
(iii)
1990
13
cm
(iv)
153
cm
(v)
2014
13
cm
Question
19
19.
Heights of 12 plants (in cm) are given below. Find the mean height.
81
68
54
98
60
68
94
55
94
56
59
94
(i)
147
2
cm
(ii)
883
12
cm
(iii)
893
12
cm
(iv)
881
12
cm
(v)
905
12
cm
Question
20
20.
Ages of 10 students (in years) are given below. Find the mean age.
15
11
11
11
11
12
12
15
14
15
(i)
127
10
years
(ii)
147
10
years
(iii)
129
10
years
(iv)
64
5
years
(v)
137
10
years
Question
21
21.
Rainfall of 10 days (in mm) are given below. Find the mean rainfall.
15
6
9
13
14
14
15
5
14
11
(i)
68
5
mm
(ii)
12
mm
(iii)
59
5
mm
(iv)
63
5
mm
(v)
58
5
mm
Question
22
22.
Scores of 10 students are given below. Find the mean score.
74
71
79
78
70
81
71
75
82
83
(i)
384
5
(ii)
382
5
(iii)
387
5
(iv)
392
5
(v)
383
5
Question
23
23.
Temperatures of 12 days (in °C) are given below. Find the mean temperature.
26
31
35
26
34
26
34
29
28
29
33
26
(i)
127
4
°C
(ii)
123
4
°C
(iii)
30
°C
(iv)
121
4
°C
(v)
119
4
°C
Question
24
24.
Weights of 13 students (in kg) are given below. Find the mean weight.
50
47
60
46
41
51
53
42
59
55
43
48
54
(i)
662
13
kg
(ii)
675
13
kg
(iii)
651
13
kg
(iv)
649
13
kg
(v)
50
kg
Question
25
25.
Daily wages of 12 labourers (in ₹) are given below. Find the mean wage.
342
485
450
341
427
338
321
488
348
356
387
421
(i)
₹
394.00
(ii)
₹
392.00
(iii)
₹
393.00
(iv)
₹
391.00
(v)
₹
390.00
Question
26
26.
If the mean of
6
samples is
34
5
6
,
what is the new mean if
8
is added to each number.
(i)
341
8
(ii)
173
4
(iii)
257
6
(iv)
259
6
(v)
85
2
Question
27
27.
If the mean of
8
samples is
21
1
4
,
what is the new mean if
6
is subtracted from each number.
(i)
61
4
(ii)
31
2
(iii)
59
4
(iv)
91
6
(v)
63
4
Question
28
28.
If the mean of
4
samples is
42
3
4
,
what is the new mean if each number is multiplied by
7
.
(i)
1199
4
(ii)
1197
4
(iii)
599
2
(iv)
1795
6
(v)
1195
4
Question
29
29.
The mean of
9
numbers is
13
1
9
.
Upon
excluding
one number,
the mean becomes
13
7
8
.
Find the
excluded
number.
(i)
8
(ii)
5
(iii)
9
(iv)
6
(v)
7
Question
30
30.
The mean of
5
numbers is
10
.
Upon
adding
one number,
the mean becomes
8
2
3
.
Find the
included
number.
(i)
-1
(ii)
2
(iii)
5
(iv)
1
(v)
3
Question
31
31.
The scores obtained by 11 students in a test are given below. Find the mean score.
13
12
12
13
15
16
7
7
6
12
12
(i)
16
(ii)
10
(iii)
12
(iv)
6
(v)
11
4
11
Question
32
32.
The arithmetic mean of a + 2, a, and a - 2 is
(i)
a
(ii)
a - 2
(iii)
a + 2
(iv)
3a
Question
33
33.
The arithmetic mean of
41
20
25
37
42
10
is
(i)
29.17
(ii)
28.17
(iii)
30.17
(iv)
31.17
(v)
27.17
Assignment Key
1) (iii)
2) (iii)
3) (iii)
4) (iv)
5) (iii)
6) (ii)
7) (iii)
8) (iii)
9) (i)
10) (iii)
11) (iii)
12) (i)
13) (iv)
14) (i)
15) (ii)
16) (iii)
17) (v)
18) (i)
19) (iv)
20) (i)
21) (v)
22) (ii)
23) (v)
24) (iv)
25) (ii)
26) (iii)
27) (i)
28) (ii)
29) (v)
30) (ii)
31) (v)
32) (i)
33) (i)
