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
2
1
4
x
5
7
6
is
5
,
find the value of x.
(i)
11
(ii)
12
(iii)
9
(iv)
8
(v)
10
Question
2
2.
The mean of the below random sample is
30
7
10
.
Find the missing quantity.
41
14
16
27
42
16
46
27
x
50
(i)
31
(ii)
27
(iii)
29
(iv)
26
(v)
28
Question
3
3.
Given the mean of
12
samples as
12
3
4
,
what is the mean if a sample value is
increased
by
14
?
(i)
55
4
(ii)
193
14
(iii)
167
12
(iv)
169
12
(v)
141
10
Question
4
4.
Given the mean of
15
samples as
11
1
15
,
what is the mean if a sample value is
decreased
by
13
?
(i)
71
7
(ii)
53
5
(iii)
51
5
(iv)
31
3
(v)
49
5
Question
5
5.
Given the mean of
10
samples as
5
1
10
,
what is the new mean if two samples
9
and
7
are added ?
(i)
11
2
(ii)
57
10
(iii)
65
12
(iv)
23
4
(v)
67
12
Question
6
6.
Given the mean of
12
samples as
6
1
6
,
what is the new mean if two samples
7
and
2
are removed ?
(i)
25
4
(ii)
13
2
(iii)
11
2
(iv)
15
2
(v)
7
Question
7
7.
Find the mean of all prime numbers between 50 and 60.
(i)
55
(ii)
59
(iii)
56
(iv)
57
(v)
54
Question
8
8.
Find the mean of all prime numbers between 50 and 80.
(i)
463
7
(ii)
465
7
(iii)
461
7
(iv)
595
9
(v)
331
5
Question
9
9.
Find the mean of first 6 multiples of 6.
(i)
22
(ii)
20
(iii)
21
(iv)
18
(v)
24
Question
10
10.
Find the mean of first 7 whole numbers.
(i)
6
(ii)
2
(iii)
4
(iv)
1
(v)
3
Question
11
11.
Find the mean of first 6 multiples of 18.
(i)
66
(ii)
63
(iii)
61
(iv)
64
(v)
62
Question
12
12.
Find the mean of the first 15 odd numbers.
(i)
15
(ii)
16
(iii)
13
(iv)
18
(v)
14
Question
13
13.
Find the mean of the first 10 even numbers.
(i)
10
(ii)
11
(iii)
12
(iv)
9
(v)
13
Question
14
14.
The marks obtained by 14 students in a test are given below. Find their mean marks.
14
25
9
2
8
44
15
42
29
43
12
23
42
47
(i)
305
12
(ii)
353
14
(iii)
355
14
(iv)
405
16
(v)
51
2
Question
15
15.
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 5.
40
34
6
20
18
13
47
23
11
7
13
35
4
36
16
(i)
450
17
(ii)
80
3
(iii)
398
15
(iv)
132
5
(v)
346
13
Question
16
16.
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 decreased by 5.
13
18
46
19
29
25
25
27
48
38
8
49
32
1
19
(i)
64
3
(ii)
108
5
(iii)
280
13
(iv)
364
17
(v)
322
15
Question
17
17.
The marks obtained by 11 students in a test are given below. Find the mean of their marks when the marks of each student is doubled.
34
7
19
24
8
48
26
39
48
2
24
(i)
658
13
(ii)
558
11
(iii)
458
9
(iv)
556
11
(v)
560
11
Question
18
18.
Heights of 10 students (in cm) are given below. Find the mean height.
163
149
175
125
160
141
145
166
139
142
(i)
151
cm
(ii)
303
2
cm
(iii)
301
2
cm
(iv)
305
2
cm
Question
19
19.
Heights of 14 plants (in cm) are given below. Find the mean height.
84
57
73
57
59
85
75
54
57
63
65
88
89
70
(i)
489
7
cm
(ii)
502
7
cm
(iii)
488
7
cm
(iv)
70
cm
(v)
495
7
cm
Question
20
20.
Ages of 11 students (in years) are given below. Find the mean age.
15
10
11
15
14
11
10
15
12
12
15
(i)
151
11
years
(ii)
140
11
years
(iii)
142
11
years
(iv)
141
11
years
(v)
162
11
years
Question
21
21.
Rainfall of 11 days (in mm) are given below. Find the mean rainfall.
12
9
5
6
14
8
7
8
12
14
15
(i)
9
mm
(ii)
8
mm
(iii)
12
mm
(iv)
10
mm
(v)
11
mm
Question
22
22.
Scores of 11 students are given below. Find the mean score.
89
76
75
81
80
90
72
81
72
71
83
(i)
892
11
(ii)
871
11
(iii)
881
11
(iv)
870
11
(v)
872
11
Question
23
23.
Temperatures of 11 days (in °C) are given below. Find the mean temperature.
28
29
27
32
34
34
28
33
33
27
27
(i)
332
11
°C
(ii)
333
11
°C
(iii)
354
11
°C
(iv)
334
11
°C
(v)
343
11
°C
Question
24
24.
Weights of 10 students (in kg) are given below. Find the mean weight.
45
40
50
49
51
59
59
43
54
48
(i)
254
5
kg
(ii)
249
5
kg
(iii)
251
5
kg
(iv)
259
5
kg
(v)
50
kg
Question
25
25.
Daily wages of 12 labourers (in ₹) are given below. Find the mean wage.
473
332
329
463
484
301
313
400
496
335
309
360
(i)
₹
383.00
(ii)
₹
382.92
(iii)
₹
383.08
(iv)
₹
383.92
(v)
₹
384.92
Question
26
26.
If the mean of
5
samples is
40
4
5
,
what is the new mean if
10
is added to each number.
(i)
354
7
(ii)
254
5
(iii)
256
5
(iv)
252
5
(v)
154
3
Question
27
27.
If the mean of
6
samples is
23
1
2
,
what is the new mean if
6
is subtracted from each number.
(i)
37
2
(ii)
35
2
(iii)
69
4
(iv)
33
2
(v)
18
Question
28
28.
If the mean of
5
samples is
25
4
5
,
what is the new mean if each number is multiplied by
8
.
(i)
1032
5
(ii)
1034
5
(iii)
620
3
(iv)
1444
7
(v)
206
Question
29
29.
The mean of
6
numbers is
11
5
6
.
Upon
excluding
one number,
the mean becomes
14
.
Find the
excluded
number.
(i)
-2
(ii)
1
(iii)
2
(iv)
0
(v)
3
Question
30
30.
The mean of
6
numbers is
7
1
2
.
Upon
adding
one number,
the mean becomes
6
5
7
.
Find the
included
number.
(i)
1
(ii)
4
(iii)
2
(iv)
3
(v)
-1
Question
31
31.
The scores obtained by 11 students in a test are given below. Find the mean score.
6
18
1
8
19
1
18
4
3
9
7
(i)
1
(ii)
19
(iii)
8
6
11
(iv)
7
(v)
18
Question
32
32.
The arithmetic mean of a + 2, a, and a - 2 is
(i)
a + 2
(ii)
3a
(iii)
a
(iv)
a - 2
Question
33
33.
The arithmetic mean of
1
36
47
14
6
45
17
is
(i)
24.71
(ii)
22.71
(iii)
23.71
(iv)
21.71
(v)
25.71
Assignment Key
1) (v)
2) (v)
3) (iii)
4) (iii)
5) (v)
6) (ii)
7) (iii)
8) (i)
9) (iii)
10) (v)
11) (ii)
12) (i)
13) (ii)
14) (iii)
15) (iii)
16) (v)
17) (ii)
18) (iii)
19) (iii)
20) (ii)
21) (iv)
22) (iv)
23) (i)
24) (ii)
25) (ii)
26) (ii)
27) (ii)
28) (i)
29) (ii)
30) (iii)
31) (iii)
32) (iii)
33) (iii)
