EduSahara™ Assignment
Name : Arithmetic Mean
Chapter : Data Handling
Grade : SSC Grade VII
License : Non Commercial Use
Question
1
1.
The scores obtained by 6 students in a test are given below. Find the mean score.
8
13
2
11
9
5
(i)
13
(ii)
2
(iii)
8
1
2
(iv)
11
(v)
8
Question
2
2.
Find the mean of all prime numbers between 10 and 100.
(i)
247
5
(ii)
149
3
(iii)
49
(iv)
151
3
(v)
51
Question
3
3.
Find the mean of all prime numbers between 30 and 60.
(i)
311
7
(ii)
309
7
(iii)
223
5
(iv)
133
3
(v)
313
7
Question
4
4.
Find the mean of first 8 multiples of 18.
(i)
78
(ii)
84
(iii)
81
(iv)
82
(v)
80
Question
5
5.
Find the mean of first 7 whole numbers.
(i)
0
(ii)
4
(iii)
3
(iv)
2
(v)
6
Question
6
6.
Find the mean of first 9 multiples of 12.
(i)
60
(ii)
59
(iii)
58
(iv)
61
(v)
63
Question
7
7.
Find the mean of the first 20 odd numbers.
(i)
20
(ii)
22
(iii)
19
(iv)
18
(v)
21
Question
8
8.
Find the mean of the first 20 even numbers.
(i)
20
(ii)
22
(iii)
21
(iv)
23
(v)
19
Question
9
9.
The marks obtained by 13 students in a test are given below. Find their mean marks.
22
25
30
2
28
45
14
21
50
32
17
28
6
(i)
322
13
(ii)
318
13
(iii)
368
15
(iv)
272
11
(v)
320
13
Question
10
10.
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 increased by 5.
40
6
4
8
21
19
23
37
40
21
44
(i)
316
11
(ii)
262
9
(iii)
320
11
(iv)
374
13
(v)
318
11
Question
11
11.
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 7.
1
28
2
4
45
7
13
19
45
45
7
42
22
40
10
(i)
17
(ii)
13
(iii)
16
(iv)
15
(v)
14
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
8
18
7
11
48
15
28
39
9
39
42
38
(i)
694
13
(ii)
802
15
(iii)
590
11
(iv)
696
13
(v)
698
13
Question
13
13.
Heights of 10 students (in cm) are given below. Find the mean height.
174
165
160
153
160
130
162
131
150
133
(i)
764
5
cm
(ii)
759
5
cm
(iii)
769
5
cm
(iv)
761
5
cm
(v)
152
cm
Question
14
14.
Heights of 11 plants (in cm) are given below. Find the mean height.
67
82
94
92
54
82
57
86
94
99
85
(i)
914
11
cm
(ii)
892
11
cm
(iii)
893
11
cm
(iv)
903
11
cm
(v)
894
11
cm
Question
15
15.
Ages of 12 students (in years) are given below. Find the mean age.
15
13
12
10
11
13
12
12
14
14
15
13
(i)
77
6
years
(ii)
13
years
(iii)
89
6
years
(iv)
79
6
years
(v)
83
6
years
Question
16
16.
Rainfall of 14 days (in mm) are given below. Find the mean rainfall.
11
7
13
15
7
6
15
15
10
8
8
7
8
9
(i)
139
14
mm
(ii)
141
14
mm
(iii)
153
14
mm
(iv)
10
mm
(v)
167
14
mm
Question
17
17.
Scores of 13 students are given below. Find the mean score.
83
76
85
70
73
77
78
70
83
85
89
79
83
(i)
1057
13
(ii)
1032
13
(iii)
1033
13
(iv)
1044
13
(v)
1031
13
Question
18
18.
Temperatures of 11 days (in °C) are given below. Find the mean temperature.
33
32
29
32
27
28
33
35
35
34
32
(i)
361
11
°C
(ii)
351
11
°C
(iii)
350
11
°C
(iv)
32
°C
(v)
372
11
°C
Question
19
19.
Weights of 11 students (in kg) are given below. Find the mean weight.
43
46
46
45
51
55
59
53
60
47
51
(i)
556
11
kg
(ii)
578
11
kg
(iii)
567
11
kg
(iv)
557
11
kg
(v)
558
11
kg
Question
20
20.
Daily wages of 12 labourers (in ₹) are given below. Find the mean wage.
400
422
338
432
435
311
433
305
332
386
412
417
(i)
₹
385.50
(ii)
₹
386.25
(iii)
₹
385.25
(iv)
₹
387.25
(v)
₹
385.75
Question
21
21.
If the mean of
7
4
x
6
3
is
5
3
5
,
find the value of x.
(i)
8
(ii)
11
(iii)
7
(iv)
5
(v)
9
Question
22
22.
The mean of the below random sample is
26
1
10
.
Find the missing quantity.
17
49
x
37
10
10
43
10
31
30
(i)
24
(ii)
21
(iii)
25
(iv)
23
(v)
26
Question
23
23.
Given the mean of
7
samples as
12
3
7
,
what is the mean if a sample value is
increased
by
14
?
(i)
101
7
(ii)
73
5
(iii)
99
7
(iv)
103
7
(v)
43
3
Question
24
24.
Given the mean of
6
samples as
14
1
2
,
what is the mean if a sample value is
decreased
by
16
?
(i)
49
4
(ii)
23
2
(iii)
71
6
(iv)
73
6
(v)
93
8
Question
25
25.
Given the mean of
10
samples as
5
3
5
,
what is the new mean if two samples
10
and
8
are added ?
(i)
49
8
(ii)
25
4
(iii)
35
6
(iv)
13
2
(v)
37
6
Question
26
26.
Given the mean of
12
samples as
5
1
2
,
what is the new mean if two samples
5
and
8
are removed ?
(i)
51
10
(ii)
53
10
(iii)
43
8
(iv)
11
2
(v)
21
4
Question
27
27.
The arithmetic mean of a + 2, a, and a - 2 is
(i)
a + 2
(ii)
a - 2
(iii)
3a
(iv)
a
Question
28
28.
The arithmetic mean of
24
35
6
25
20
32
3
is
(i)
22.71
(ii)
19.71
(iii)
21.71
(iv)
18.71
(v)
20.71
Question
29
29.
If the mean of
4
samples is
32
1
4
,
what is the new mean if
10
is added to each number.
(i)
171
4
(ii)
253
6
(iii)
167
4
(iv)
85
2
(v)
169
4
Question
30
30.
If the mean of
7
samples is
26
5
7
,
what is the new mean if
5
is subtracted from each number.
(i)
150
7
(ii)
152
7
(iii)
22
(iv)
194
9
Question
31
31.
If the mean of
5
samples is
23
1
5
,
what is the new mean if each number is multiplied by
6
.
(i)
696
5
(ii)
974
7
(iii)
694
5
(iv)
418
3
(v)
698
5
Question
32
32.
The mean of
6
numbers is
10
1
2
.
Upon
excluding
one number,
the mean becomes
9
1
5
.
Find the
excluded
number.
(i)
19
(ii)
14
(iii)
16
(iv)
17
(v)
18
Question
33
33.
The mean of
8
numbers is
11
5
8
.
Upon
adding
one number,
the mean becomes
11
2
3
.
Find the
included
number.
(i)
13
(ii)
14
(iii)
10
(iv)
12
(v)
11
Assignment Key
1) (v)
2) (ii)
3) (i)
4) (iii)
5) (iii)
6) (i)
7) (i)
8) (iii)
9) (v)
10) (v)
11) (iv)
12) (iv)
13) (ii)
14) (ii)
15) (i)
16) (i)
17) (v)
18) (iii)
19) (i)
20) (iii)
21) (i)
22) (i)
23) (i)
24) (iii)
25) (v)
26) (ii)
27) (iv)
28) (v)
29) (v)
30) (ii)
31) (i)
32) (iv)
33) (iv)
