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
10
1
x
7
2
is
5
1
3
,
find the value of x.
(i)
11
(ii)
8
(iii)
9
(iv)
6
(v)
10
Question
2
2.
The mean of the below random sample is
26
3
5
.
Find the missing quantity.
32
31
12
37
33
18
28
37
x
17
(i)
22
(ii)
21
(iii)
18
(iv)
23
(v)
20
Question
3
3.
Given the mean of
13
samples as
7
,
what is the mean if a sample value is
increased
by
20
?
(i)
95
11
(ii)
127
15
(iii)
111
13
(iv)
113
13
(v)
109
13
Question
4
4.
Given the mean of
11
samples as
10
1
11
,
what is the mean if a sample value is
decreased
by
16
?
(i)
95
11
(ii)
97
11
(iii)
79
9
(iv)
93
11
(v)
111
13
Question
5
5.
Given the mean of
10
samples as
5
1
5
,
what is the new mean if two samples
9
and
9
are added ?
(i)
45
8
(ii)
37
6
(iii)
11
2
(iv)
35
6
(v)
25
4
Question
6
6.
Given the mean of
12
samples as
5
1
2
,
what is the new mean if two samples
9
and
9
are removed ?
(i)
16
3
(ii)
22
5
(iii)
26
5
(iv)
32
7
(v)
24
5
Question
7
7.
Find the mean of all prime numbers between 20 and 70.
(i)
579
13
(ii)
489
11
(iii)
403
9
(iv)
493
11
(v)
491
11
Question
8
8.
Find the mean of all prime numbers between 20 and 90.
(i)
553
10
(ii)
443
8
(iii)
445
8
(iv)
111
2
(v)
441
8
Question
9
9.
Find the mean of first 10 multiples of 18.
(i)
96
(ii)
98
(iii)
99
(iv)
101
(v)
100
Question
10
10.
Find the mean of first 6 whole numbers.
(i)
3
2
(ii)
9
4
(iii)
7
2
(iv)
3
(v)
5
2
Question
11
11.
Find the mean of first 5 multiples of 20.
(i)
58
(ii)
59
(iii)
61
(iv)
63
(v)
60
Question
12
12.
Find the mean of the first 10 odd numbers.
(i)
9
(ii)
11
(iii)
8
(iv)
10
(v)
12
Question
13
13.
Find the mean of the first 10 even numbers.
(i)
8
(ii)
12
(iii)
10
(iv)
11
(v)
14
Question
14
14.
The marks obtained by 12 students in a test are given below. Find their mean marks.
47
33
4
12
22
22
42
9
16
26
33
15
(i)
281
12
(ii)
327
14
(iii)
93
4
(iv)
283
12
(v)
47
2
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.
41
45
4
23
6
46
26
38
29
31
(i)
391
10
(ii)
387
10
(iii)
155
4
(iv)
313
8
(v)
389
10
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 1.
26
42
38
16
42
46
31
32
18
12
20
10
2
3
(i)
160
7
(ii)
208
9
(iii)
162
7
(iv)
116
5
(v)
164
7
Question
17
17.
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 doubled.
1
15
46
5
48
30
36
16
39
43
10
18
21
1
(i)
46
(ii)
44
(iii)
48
(iv)
47
(v)
49
Question
18
18.
Heights of 10 students (in cm) are given below. Find the mean height.
139
145
172
126
131
161
143
173
164
174
(i)
766
5
cm
(ii)
774
5
cm
(iii)
764
5
cm
(iv)
153
cm
(v)
769
5
cm
Question
19
19.
Heights of 11 plants (in cm) are given below. Find the mean height.
85
63
55
68
79
76
58
67
76
81
51
(i)
69
cm
(ii)
68
cm
(iii)
70
cm
(iv)
71
cm
(v)
67
cm
Question
20
20.
Ages of 11 students (in years) are given below. Find the mean age.
10
11
13
12
14
14
10
11
11
10
14
(i)
131
11
years
(ii)
130
11
years
(iii)
141
11
years
(iv)
152
11
years
(v)
12
years
Question
21
21.
Rainfall of 11 days (in mm) are given below. Find the mean rainfall.
6
12
14
5
12
11
5
14
14
15
9
(i)
118
11
mm
(ii)
139
11
mm
(iii)
119
11
mm
(iv)
117
11
mm
(v)
128
11
mm
Question
22
22.
Scores of 14 students are given below. Find the mean score.
72
81
76
86
85
73
88
86
75
73
89
88
83
87
(i)
572
7
(ii)
578
7
(iii)
571
7
(iv)
573
7
(v)
585
7
Question
23
23.
Temperatures of 11 days (in °C) are given below. Find the mean temperature.
34
35
30
28
28
35
29
33
29
26
28
(i)
357
11
°C
(ii)
336
11
°C
(iii)
346
11
°C
(iv)
337
11
°C
(v)
335
11
°C
Question
24
24.
Weights of 11 students (in kg) are given below. Find the mean weight.
42
40
41
60
52
60
56
59
41
43
54
(i)
548
11
kg
(ii)
50
kg
(iii)
570
11
kg
(iv)
559
11
kg
(v)
549
11
kg
Question
25
25.
Daily wages of 10 labourers (in ₹) are given below. Find the mean wage.
466
483
460
360
427
394
437
440
459
407
(i)
₹
435.30
(ii)
₹
434.30
(iii)
₹
433.50
(iv)
₹
433.40
(v)
₹
433.30
Question
26
26.
If the mean of
5
samples is
17
2
5
,
what is the new mean if
10
is added to each number.
(i)
191
7
(ii)
83
3
(iii)
137
5
(iv)
139
5
(v)
27
Question
27
27.
If the mean of
8
samples is
27
1
4
,
what is the new mean if
6
is subtracted from each number.
(i)
87
4
(ii)
127
6
(iii)
43
2
(iv)
85
4
(v)
83
4
Question
28
28.
If the mean of
8
samples is
27
1
2
,
what is the new mean if each number is multiplied by
6
.
(i)
168
(ii)
164
(iii)
165
(iv)
163
(v)
166
Question
29
29.
The mean of
5
numbers is
7
.
Upon
excluding
one number,
the mean becomes
8
1
2
.
Find the
excluded
number.
(i)
2
(ii)
1
(iii)
0
(iv)
-1
(v)
3
Question
30
30.
The mean of
10
numbers is
10
3
10
.
Upon
adding
one number,
the mean becomes
11
2
11
.
Find the
included
number.
(i)
18
(ii)
19
(iii)
21
(iv)
22
(v)
20
Question
31
31.
The scores obtained by 7 students in a test are given below. Find the mean score.
7
1
8
1
12
19
4
(i)
1
(ii)
7
(iii)
19
(iv)
7
3
7
(v)
18
Question
32
32.
The arithmetic mean of a + 2, a, and a - 2 is
(i)
3a
(ii)
a
(iii)
a + 2
(iv)
a - 2
Question
33
33.
The arithmetic mean of
32
41
19
2
1
13
is
(i)
19
(ii)
20
(iii)
16
(iv)
17
(v)
18
Assignment Key
1) (iii)
2) (ii)
3) (iii)
4) (i)
5) (iv)
6) (v)
7) (v)
8) (ii)
9) (iii)
10) (v)
11) (v)
12) (iv)
13) (iv)
14) (i)
15) (v)
16) (iii)
17) (iv)
18) (iii)
19) (i)
20) (ii)
21) (iv)
22) (iii)
23) (v)
24) (i)
25) (v)
26) (iii)
27) (iv)
28) (iii)
29) (ii)
30) (v)
31) (iv)
32) (ii)
33) (v)
