EduSahara™ Assignment
Name : Arithmetic Mean
Chapter : Data Handling
Grade : SSC Grade VII
License : Non Commercial Use
Question
1
1.
The scores obtained by 13 students in a test are given below. Find the mean score.
16
8
12
16
9
18
7
20
14
12
4
4
17
(i)
16
(ii)
4
(iii)
12
(iv)
20
(v)
12
1
13
Question
2
2.
Find the mean of all prime numbers between 40 and 100.
(i)
863
13
(ii)
199
3
(iii)
861
13
(iv)
865
13
(v)
731
11
Question
3
3.
Find the mean of all prime numbers between 10 and 80.
(i)
43
(ii)
42
(iii)
44
(iv)
40
(v)
45
Question
4
4.
Find the mean of first 5 multiples of 5.
(i)
18
(ii)
13
(iii)
15
(iv)
14
(v)
16
Question
5
5.
Find the mean of first 5 whole numbers.
(i)
1
(ii)
5
(iii)
3
(iv)
2
(v)
0
Question
6
6.
Find the mean of first 7 multiples of 19.
(i)
79
(ii)
77
(iii)
76
(iv)
75
(v)
74
Question
7
7.
Find the mean of the first 20 odd numbers.
(i)
18
(ii)
21
(iii)
20
(iv)
19
(v)
23
Question
8
8.
Find the mean of the first 15 even numbers.
(i)
15
(ii)
14
(iii)
17
(iv)
19
(v)
16
Question
9
9.
The marks obtained by 13 students in a test are given below. Find their mean marks.
10
48
27
12
44
21
17
38
37
42
12
13
16
(i)
337
13
(ii)
339
13
(iii)
287
11
(iv)
129
5
(v)
335
13
Question
10
10.
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 increased by 9.
40
17
20
3
18
50
7
10
5
33
47
36
39
34
(i)
69
2
(ii)
485
14
(iii)
487
14
(iv)
553
16
(v)
139
4
Question
11
11.
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 decreased by 1.
42
42
44
50
32
50
34
15
40
28
(i)
369
10
(ii)
367
10
(iii)
439
12
(iv)
295
8
(v)
73
2
Question
12
12.
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 doubled.
27
50
27
15
3
24
1
35
27
18
(i)
137
3
(ii)
229
5
(iii)
317
7
(iv)
227
5
(v)
45
Question
13
13.
Heights of 12 students (in cm) are given below. Find the mean height.
134
171
160
164
152
132
130
150
156
166
163
141
(i)
1831
12
cm
(ii)
607
4
cm
(iii)
1819
12
cm
(iv)
1843
12
cm
(v)
455
3
cm
Question
14
14.
Heights of 15 plants (in cm) are given below. Find the mean height.
78
70
54
89
92
60
56
78
79
73
85
84
58
80
65
(i)
368
5
cm
(ii)
369
5
cm
(iii)
377
5
cm
(iv)
372
5
cm
(v)
367
5
cm
Question
15
15.
Ages of 11 students (in years) are given below. Find the mean age.
13
11
15
12
15
13
11
13
14
13
15
(i)
147
11
years
(ii)
146
11
years
(iii)
145
11
years
(iv)
167
11
years
(v)
156
11
years
Question
16
16.
Rainfall of 10 days (in mm) are given below. Find the mean rainfall.
11
7
15
10
15
9
14
12
13
8
(i)
67
5
mm
(ii)
57
5
mm
(iii)
62
5
mm
(iv)
59
5
mm
(v)
58
5
mm
Question
17
17.
Scores of 14 students are given below. Find the mean score.
84
76
73
79
83
78
83
83
88
86
74
87
75
82
(i)
1133
14
(ii)
566
7
(iii)
1145
14
(iv)
1131
14
(v)
1159
14
Question
18
18.
Temperatures of 15 days (in °C) are given below. Find the mean temperature.
30
32
35
30
32
28
32
26
35
33
28
26
32
25
28
(i)
151
5
°C
(ii)
467
15
°C
(iii)
452
15
°C
(iv)
482
15
°C
(v)
454
15
°C
Question
19
19.
Weights of 12 students (in kg) are given below. Find the mean weight.
54
44
49
53
47
40
48
43
57
57
54
59
(i)
617
12
kg
(ii)
607
12
kg
(iii)
101
2
kg
(iv)
629
12
kg
(v)
605
12
kg
Question
20
20.
Daily wages of 11 labourers (in ₹) are given below. Find the mean wage.
419
337
490
411
493
421
407
427
393
397
406
(i)
₹
419.27
(ii)
₹
420.27
(iii)
₹
418.45
(iv)
₹
418.36
(v)
₹
418.27
Question
21
21.
If the mean of
7
8
x
10
1
is
6
,
find the value of x.
(i)
5
(ii)
4
(iii)
7
(iv)
3
(v)
2
Question
22
22.
The mean of the below random sample is
24
3
5
.
Find the missing quantity.
14
30
11
13
27
44
x
48
33
10
(i)
17
(ii)
13
(iii)
16
(iv)
19
(v)
15
Question
23
23.
Given the mean of
6
samples as
9
1
2
,
what is the mean if a sample value is
increased
by
19
?
(i)
14
(ii)
12
(iii)
62
5
(iv)
40
3
(v)
38
3
Question
24
24.
Given the mean of
9
samples as
12
4
9
,
what is the mean if a sample value is
decreased
by
20
?
(i)
10
(ii)
92
9
(iii)
94
9
(iv)
112
11
(v)
72
7
Question
25
25.
Given the mean of
10
samples as
6
7
10
,
what is the new mean if two samples
2
and
5
are added ?
(i)
25
4
(ii)
37
6
(iii)
49
8
(iv)
35
6
(v)
13
2
Question
26
26.
Given the mean of
12
samples as
5
1
3
,
what is the new mean if two samples
2
and
9
are removed ?
(i)
51
10
(ii)
21
4
(iii)
11
2
(iv)
53
10
(v)
43
8
Question
27
27.
The arithmetic mean of a + 2, a, and a - 2 is
(i)
a + 2
(ii)
a
(iii)
a - 2
(iv)
3a
Question
28
28.
The arithmetic mean of
9
27
38
48
5
45
25
is
(i)
26.14
(ii)
28.14
(iii)
29.14
(iv)
27.14
(v)
30.14
Question
29
29.
If the mean of
4
samples is
34
,
what is the new mean if
6
is added to each number.
(i)
42
(ii)
41
(iii)
37
(iv)
40
(v)
39
Question
30
30.
If the mean of
5
samples is
19
3
5
,
what is the new mean if
10
is subtracted from each number.
(i)
66
7
(ii)
46
5
(iii)
10
(iv)
48
5
Question
31
31.
If the mean of
6
samples is
33
1
2
,
what is the new mean if each number is multiplied by
3
.
(i)
101
(ii)
401
4
(iii)
203
2
(iv)
201
2
(v)
199
2
Question
32
32.
The mean of
9
numbers is
9
.
Upon
excluding
one number,
the mean becomes
8
7
8
.
Find the
excluded
number.
(i)
10
(ii)
12
(iii)
11
(iv)
7
(v)
9
Question
33
33.
The mean of
10
numbers is
9
1
2
.
Upon
adding
one number,
the mean becomes
9
1
11
.
Find the
included
number.
(i)
7
(ii)
5
(iii)
4
(iv)
3
(v)
6
Assignment Key
1) (v)
2) (i)
3) (i)
4) (iii)
5) (iv)
6) (iii)
7) (iii)
8) (v)
9) (i)
10) (ii)
11) (ii)
12) (iv)
13) (iii)
14) (v)
15) (iii)
16) (ii)
17) (iv)
18) (iii)
19) (v)
20) (v)
21) (ii)
22) (iii)
23) (v)
24) (ii)
25) (ii)
26) (iv)
27) (ii)
28) (ii)
29) (iv)
30) (iv)
31) (iv)
32) (i)
33) (ii)
