EduSahara™ Assignment
Name : Arithmetic Mean
Chapter : Data Handling
Grade : SSC Grade VII
License : Non Commercial Use
Question
1
1.
The scores obtained by 9 students in a test are given below. Find the mean score.
12
3
14
16
1
13
15
3
13
(i)
15
(ii)
13
(iii)
10
(iv)
1
(v)
16
Question
2
2.
Find the mean of all prime numbers between 40 and 70.
(i)
56
(ii)
52
(iii)
53
(iv)
54
(v)
50
Question
3
3.
Find the mean of all prime numbers between 50 and 80.
(i)
465
7
(ii)
463
7
(iii)
461
7
(iv)
595
9
(v)
331
5
Question
4
4.
Find the mean of first 9 multiples of 15.
(i)
76
(ii)
74
(iii)
77
(iv)
75
(v)
72
Question
5
5.
Find the mean of first 9 whole numbers.
(i)
1
(ii)
4
(iii)
3
(iv)
6
(v)
5
Question
6
6.
Find the mean of first 5 multiples of 2.
(i)
6
(ii)
7
(iii)
3
(iv)
8
(v)
5
Question
7
7.
Find the mean of the first 15 odd numbers.
(i)
13
(ii)
15
(iii)
14
(iv)
18
(v)
16
Question
8
8.
Find the mean of the first 15 even numbers.
(i)
16
(ii)
17
(iii)
19
(iv)
15
(v)
13
Question
9
9.
The marks obtained by 12 students in a test are given below. Find their mean marks.
20
43
5
40
30
27
27
7
40
25
38
12
(i)
155
6
(ii)
105
4
(iii)
209
8
(iv)
157
6
(v)
53
2
Question
10
10.
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 increased by 1.
35
27
6
15
44
35
30
49
25
6
36
7
37
(i)
309
11
(ii)
363
13
(iii)
367
13
(iv)
421
15
(v)
365
13
Question
11
11.
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 decreased by 1.
46
6
10
3
46
12
43
19
50
18
31
(i)
271
11
(ii)
273
11
(iii)
321
13
(iv)
25
Question
12
12.
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.
46
45
2
20
44
23
48
29
22
16
8
24
15
(i)
686
13
(ii)
682
13
(iii)
684
13
(iv)
580
11
(v)
788
15
Question
13
13.
Heights of 10 students (in cm) are given below. Find the mean height.
138
145
144
133
140
132
131
125
157
148
(i)
1393
10
cm
(ii)
697
5
cm
(iii)
1403
10
cm
(iv)
1413
10
cm
(v)
279
2
cm
Question
14
14.
Heights of 12 plants (in cm) are given below. Find the mean height.
92
88
76
87
60
63
97
61
78
54
93
92
(i)
965
12
cm
(ii)
953
12
cm
(iii)
943
12
cm
(iv)
157
2
cm
(v)
941
12
cm
Question
15
15.
Ages of 13 students (in years) are given below. Find the mean age.
13
14
11
10
13
12
11
13
15
10
15
11
12
(i)
161
13
years
(ii)
173
13
years
(iii)
160
13
years
(iv)
162
13
years
(v)
186
13
years
Question
16
16.
Rainfall of 10 days (in mm) are given below. Find the mean rainfall.
6
7
8
7
6
15
7
11
11
12
(i)
8
mm
(ii)
7
mm
(iii)
10
mm
(iv)
11
mm
(v)
9
mm
Question
17
17.
Scores of 13 students are given below. Find the mean score.
78
86
81
80
72
87
73
72
79
74
83
82
78
(i)
1051
13
(ii)
1038
13
(iii)
79
(iv)
1025
13
(v)
1026
13
Question
18
18.
Temperatures of 10 days (in °C) are given below. Find the mean temperature.
27
27
30
27
26
34
35
28
31
25
(i)
28
°C
(ii)
29
°C
(iii)
30
°C
(iv)
27
°C
(v)
31
°C
Question
19
19.
Weights of 14 students (in kg) are given below. Find the mean weight.
40
59
50
59
46
48
42
54
57
43
46
45
46
57
(i)
348
7
kg
(ii)
347
7
kg
(iii)
360
7
kg
(iv)
346
7
kg
(v)
353
7
kg
Question
20
20.
Daily wages of 10 labourers (in ₹) are given below. Find the mean wage.
491
381
435
479
446
380
360
454
441
475
(i)
₹
434.60
(ii)
₹
436.20
(iii)
₹
434.40
(iv)
₹
435.20
(v)
₹
434.20
Question
21
21.
If the mean of
3
5
8
x
9
4
is
5
5
6
,
find the value of x.
(i)
4
(ii)
6
(iii)
5
(iv)
9
(v)
7
Question
22
22.
The mean of the below random sample is
28
1
5
.
Find the missing quantity.
13
x
27
25
32
50
25
34
22
39
(i)
17
(ii)
15
(iii)
12
(iv)
16
(v)
14
Question
23
23.
Given the mean of
7
samples as
10
1
7
,
what is the mean if a sample value is
increased
by
18
?
(i)
89
7
(ii)
13
(iii)
87
7
(iv)
113
9
Question
24
24.
Given the mean of
7
samples as
13
6
7
,
what is the mean if a sample value is
decreased
by
14
?
(i)
83
7
(ii)
35
3
(iii)
61
5
(iv)
85
7
(v)
81
7
Question
25
25.
Given the mean of
10
samples as
5
2
5
,
what is the new mean if two samples
2
and
6
are added ?
(i)
11
2
(ii)
31
6
(iii)
29
6
(iv)
21
4
(v)
41
8
Question
26
26.
Given the mean of
12
samples as
6
5
6
,
what is the new mean if two samples
3
and
10
are removed ?
(i)
27
4
(ii)
71
10
(iii)
69
10
(iv)
67
10
(v)
57
8
Question
27
27.
The arithmetic mean of a + 2, a, and a - 2 is
(i)
3a
(ii)
a - 2
(iii)
a
(iv)
a + 2
Question
28
28.
The arithmetic mean of
38
23
19
50
5
29
25
10
is
(i)
26.88
(ii)
23.88
(iii)
24.88
(iv)
25.88
(v)
22.88
Question
29
29.
If the mean of
8
samples is
20
3
4
,
what is the new mean if
8
is added to each number.
(i)
117
4
(ii)
59
2
(iii)
57
2
(iv)
115
4
(v)
113
4
Question
30
30.
If the mean of
5
samples is
23
,
what is the new mean if
3
is subtracted from each number.
(i)
21
(ii)
23
(iii)
19
(iv)
18
(v)
20
Question
31
31.
If the mean of
7
samples is
22
6
7
,
what is the new mean if each number is multiplied by
8
.
(i)
1280
7
(ii)
548
3
(iii)
916
5
(iv)
1282
7
(v)
1278
7
Question
32
32.
The mean of
8
numbers is
13
1
2
.
Upon
excluding
one number,
the mean becomes
14
5
7
.
Find the
excluded
number.
(i)
4
(ii)
3
(iii)
6
(iv)
5
(v)
7
Question
33
33.
The mean of
8
numbers is
11
1
2
.
Upon
adding
one number,
the mean becomes
11
1
9
.
Find the
included
number.
(i)
7
(ii)
9
(iii)
10
(iv)
8
(v)
6
Assignment Key
1) (iii)
2) (iii)
3) (ii)
4) (iv)
5) (ii)
6) (i)
7) (ii)
8) (i)
9) (iv)
10) (v)
11) (ii)
12) (iii)
13) (i)
14) (v)
15) (iii)
16) (v)
17) (iv)
18) (ii)
19) (iv)
20) (v)
21) (ii)
22) (ii)
23) (i)
24) (i)
25) (ii)
26) (iii)
27) (iii)
28) (iii)
29) (iv)
30) (v)
31) (i)
32) (iv)
33) (iv)
