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
10
3
2
6
x
7
1
9
is
5
3
8
,
find the value of x.
(i)
5
(ii)
6
(iii)
8
(iv)
2
(v)
4
Question
2
2.
The mean of the below random sample is
31
9
10
.
Find the missing quantity.
47
20
x
20
48
49
42
26
17
32
(i)
16
(ii)
19
(iii)
18
(iv)
17
(v)
21
Question
3
3.
Given the mean of
11
samples as
9
2
11
,
what is the mean if a sample value is
increased
by
10
?
(i)
113
11
(ii)
91
9
(iii)
109
11
(iv)
131
13
(v)
111
11
Question
4
4.
Given the mean of
14
samples as
9
11
14
,
what is the mean if a sample value is
decreased
by
11
?
(i)
9
(ii)
7
(iii)
10
(iv)
8
(v)
11
Question
5
5.
Given the mean of
10
samples as
5
1
5
,
what is the new mean if two samples
6
and
9
are added ?
(i)
67
12
(ii)
23
4
(iii)
57
10
(iv)
11
2
(v)
65
12
Question
6
6.
Given the mean of
12
samples as
5
7
12
,
what is the new mean if two samples
3
and
4
are removed ?
(i)
5
(ii)
9
(iii)
7
(iv)
3
(v)
6
Question
7
7.
Find the mean of all prime numbers between 30 and 80.
(i)
329
6
(ii)
111
2
(iii)
441
8
(iv)
221
4
(v)
331
6
Question
8
8.
Find the mean of all prime numbers between 30 and 70.
(i)
49
(ii)
439
9
(iii)
437
9
(iv)
535
11
Question
9
9.
Find the mean of first 6 multiples of 5.
(i)
35
2
(ii)
18
(iii)
33
2
(iv)
69
4
(v)
37
2
Question
10
10.
Find the mean of first 10 whole numbers.
(i)
5
(ii)
11
2
(iii)
7
2
(iv)
9
2
(v)
17
4
Question
11
11.
Find the mean of first 9 multiples of 13.
(i)
64
(ii)
65
(iii)
66
(iv)
68
(v)
63
Question
12
12.
Find the mean of the first 15 odd numbers.
(i)
16
(ii)
14
(iii)
17
(iv)
13
(v)
15
Question
13
13.
Find the mean of the first 10 even numbers.
(i)
10
(ii)
12
(iii)
11
(iv)
9
(v)
14
Question
14
14.
The marks obtained by 12 students in a test are given below. Find their mean marks.
15
29
17
6
48
33
30
31
27
23
14
36
(i)
105
4
(ii)
101
4
(iii)
51
2
(iv)
53
2
(v)
103
4
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 3.
15
16
50
11
36
17
11
27
49
3
(i)
51
2
(ii)
105
4
(iii)
27
(iv)
55
2
(v)
53
2
Question
16
16.
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 decreased by 6.
9
24
1
44
50
31
47
33
18
10
39
35
26
(i)
289
13
(ii)
245
11
(iii)
287
13
(iv)
291
13
(v)
111
5
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.
28
37
42
44
35
24
35
23
37
38
8
46
(i)
397
6
(ii)
529
8
(iii)
133
2
(iv)
395
6
(v)
265
4
Question
18
18.
Heights of 15 students (in cm) are given below. Find the mean height.
140
131
132
156
158
170
166
171
150
145
143
167
138
150
138
(i)
151
cm
(ii)
454
3
cm
(iii)
457
3
cm
(iv)
451
3
cm
(v)
452
3
cm
Question
19
19.
Heights of 14 plants (in cm) are given below. Find the mean height.
61
77
58
91
53
53
93
51
60
96
81
71
91
56
(i)
71
cm
(ii)
498
7
cm
(iii)
496
7
cm
(iv)
510
7
cm
(v)
503
7
cm
Question
20
20.
Ages of 13 students (in years) are given below. Find the mean age.
13
12
11
10
13
13
14
11
15
13
13
11
15
(i)
190
13
years
(ii)
164
13
years
(iii)
165
13
years
(iv)
166
13
years
(v)
177
13
years
Question
21
21.
Rainfall of 13 days (in mm) are given below. Find the mean rainfall.
6
13
9
6
12
14
7
13
6
7
15
5
13
(i)
152
13
mm
(ii)
127
13
mm
(iii)
128
13
mm
(iv)
139
13
mm
(v)
126
13
mm
Question
22
22.
Scores of 15 students are given below. Find the mean score.
77
77
76
75
72
84
74
80
72
78
75
90
87
83
81
(i)
394
5
(ii)
1196
15
(iii)
1181
15
(iv)
1183
15
(v)
1211
15
Question
23
23.
Temperatures of 14 days (in °C) are given below. Find the mean temperature.
34
30
30
33
32
32
29
27
27
27
30
32
28
27
(i)
30
°C
(ii)
216
7
°C
(iii)
211
7
°C
(iv)
209
7
°C
(v)
223
7
°C
Question
24
24.
Weights of 15 students (in kg) are given below. Find the mean weight.
58
40
56
40
49
56
54
40
60
46
45
52
59
48
51
(i)
151
3
kg
(ii)
769
15
kg
(iii)
252
5
kg
(iv)
784
15
kg
(v)
754
15
kg
Question
25
25.
Daily wages of 11 labourers (in ₹) are given below. Find the mean wage.
381
372
400
441
449
392
382
326
412
338
329
(i)
₹
383.91
(ii)
₹
383.82
(iii)
₹
385.82
(iv)
₹
384.00
(v)
₹
384.82
Question
26
26.
If the mean of
4
samples is
11
1
4
,
what is the new mean if
4
is added to each number.
(i)
59
4
(ii)
31
2
(iii)
61
4
(iv)
91
6
(v)
63
4
Question
27
27.
If the mean of
7
samples is
27
6
7
,
what is the new mean if
8
is subtracted from each number.
(i)
137
7
(ii)
139
7
(iii)
59
3
(iv)
101
5
(v)
141
7
Question
28
28.
If the mean of
5
samples is
27
2
5
,
what is the new mean if each number is multiplied by
10
.
(i)
277
(ii)
275
(iii)
272
(iv)
273
(v)
274
Question
29
29.
The mean of
6
numbers is
11
1
3
.
Upon
excluding
one number,
the mean becomes
10
2
5
.
Find the
excluded
number.
(i)
16
(ii)
17
(iii)
15
(iv)
18
(v)
13
Question
30
30.
The mean of
7
numbers is
12
4
7
.
Upon
adding
one number,
the mean becomes
13
1
8
.
Find the
included
number.
(i)
20
(ii)
15
(iii)
18
(iv)
17
(v)
16
Question
31
31.
The scores obtained by 14 students in a test are given below. Find the mean score.
1
17
15
5
12
20
12
12
15
14
8
2
19
11
(i)
20
(ii)
1
(iii)
12
(iv)
19
(v)
11
9
14
Question
32
32.
The arithmetic mean of a + 2, a, and a - 2 is
(i)
a - 2
(ii)
3a
(iii)
a + 2
(iv)
a
Question
33
33.
The arithmetic mean of
25
20
43
8
50
is
(i)
29.2
(ii)
27.2
(iii)
28.2
(iv)
31.2
(v)
30.2
Assignment Key
1) (i)
2) (iii)
3) (v)
4) (i)
5) (i)
6) (v)
7) (v)
8) (ii)
9) (i)
10) (iv)
11) (ii)
12) (v)
13) (iii)
14) (v)
15) (v)
16) (i)
17) (i)
18) (iv)
19) (iii)
20) (ii)
21) (v)
22) (iii)
23) (iv)
24) (v)
25) (ii)
26) (iii)
27) (ii)
28) (v)
29) (i)
30) (iv)
31) (v)
32) (iv)
33) (i)
