EduSahara™ Assignment
Name : Arithmetic Mean
Chapter : Data Handling
Grade : SSC Grade VII
License : Non Commercial Use
Question
1
1.
The scores obtained by 14 students in a test are given below. Find the mean score.
1
14
9
8
19
15
10
18
17
6
1
17
1
3
(i)
1
(ii)
19
(iii)
18
(iv)
9
13
14
(v)
9
1
2
Question
2
2.
Find the mean of all prime numbers between 20 and 80.
(i)
51
(ii)
52
(iii)
50
(iv)
49
(v)
54
Question
3
3.
Find the mean of all prime numbers between 40 and 80.
(i)
299
5
(ii)
179
3
(iii)
59
(iv)
415
7
(v)
297
5
Question
4
4.
Find the mean of first 5 multiples of 16.
(i)
51
(ii)
49
(iii)
48
(iv)
47
(v)
45
Question
5
5.
Find the mean of first 7 whole numbers.
(i)
1
(ii)
6
(iii)
3
(iv)
4
(v)
2
Question
6
6.
Find the mean of first 6 multiples of 5.
(i)
37
2
(ii)
33
2
(iii)
69
4
(iv)
35
2
(v)
18
Question
7
7.
Find the mean of the first 20 odd numbers.
(i)
22
(ii)
20
(iii)
19
(iv)
18
(v)
21
Question
8
8.
Find the mean of the first 10 even numbers.
(i)
11
(ii)
12
(iii)
10
(iv)
14
(v)
9
Question
9
9.
The marks obtained by 12 students in a test are given below. Find their mean marks.
37
43
49
49
22
5
48
3
24
9
11
14
(i)
155
6
(ii)
157
6
(iii)
53
2
(iv)
209
8
(v)
105
4
Question
10
10.
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 increased by 7.
3
19
40
11
34
38
24
9
29
4
28
21
(i)
88
3
(ii)
86
3
(iii)
28
(iv)
142
5
(v)
30
Question
11
11.
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 decreased by 10.
2
16
34
50
43
33
42
17
48
7
21
13
41
1
(i)
146
9
(ii)
16
(iii)
82
5
(iv)
114
7
(v)
116
7
Question
12
12.
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 doubled.
45
1
37
3
17
17
4
15
38
31
13
46
29
16
42
(i)
234
5
(ii)
238
5
(iii)
330
7
(iv)
142
3
(v)
236
5
Question
13
13.
Heights of 13 students (in cm) are given below. Find the mean height.
175
134
167
133
128
128
153
136
174
137
166
173
149
(i)
1966
13
cm
(ii)
1953
13
cm
(iii)
1954
13
cm
(iv)
1955
13
cm
(v)
1979
13
cm
Question
14
14.
Heights of 15 plants (in cm) are given below. Find the mean height.
98
57
75
85
92
65
86
92
69
90
72
64
91
69
97
(i)
1232
15
cm
(ii)
1217
15
cm
(iii)
401
5
cm
(iv)
1202
15
cm
(v)
1204
15
cm
Question
15
15.
Ages of 12 students (in years) are given below. Find the mean age.
10
13
13
11
13
15
13
11
10
11
11
15
(i)
25
2
years
(ii)
79
6
years
(iii)
85
6
years
(iv)
73
6
years
(v)
37
3
years
Question
16
16.
Rainfall of 13 days (in mm) are given below. Find the mean rainfall.
8
11
9
11
13
8
14
10
9
8
8
14
8
(i)
157
13
mm
(ii)
133
13
mm
(iii)
132
13
mm
(iv)
144
13
mm
(v)
131
13
mm
Question
17
17.
Scores of 11 students are given below. Find the mean score.
77
89
74
82
73
90
79
74
74
84
80
(i)
878
11
(ii)
898
11
(iii)
887
11
(iv)
876
11
(v)
877
11
Question
18
18.
Temperatures of 13 days (in °C) are given below. Find the mean temperature.
28
25
34
27
28
26
27
32
35
28
33
31
27
(i)
407
13
°C
(ii)
383
13
°C
(iii)
381
13
°C
(iv)
394
13
°C
(v)
382
13
°C
Question
19
19.
Weights of 14 students (in kg) are given below. Find the mean weight.
59
56
42
59
58
45
54
44
54
57
45
41
43
41
(i)
349
7
kg
(ii)
356
7
kg
(iii)
351
7
kg
(iv)
363
7
kg
(v)
50
kg
Question
20
20.
Daily wages of 12 labourers (in ₹) are given below. Find the mean wage.
458
474
480
368
400
369
445
428
449
331
302
440
(i)
₹
414.00
(ii)
₹
410.00
(iii)
₹
413.00
(iv)
₹
411.00
(v)
₹
412.00
Question
21
21.
If the mean of
9
3
2
x
7
10
is
6
1
6
,
find the value of x.
(i)
4
(ii)
9
(iii)
6
(iv)
7
(v)
5
Question
22
22.
The mean of the below random sample is
26
1
5
.
Find the missing quantity.
21
20
13
20
28
39
28
14
47
x
(i)
31
(ii)
33
(iii)
30
(iv)
35
(v)
32
Question
23
23.
Given the mean of
13
samples as
13
3
13
,
what is the mean if a sample value is
increased
by
10
?
(i)
14
(ii)
16
(iii)
13
(iv)
12
(v)
15
Question
24
24.
Given the mean of
13
samples as
9
12
13
,
what is the mean if a sample value is
decreased
by
16
?
(i)
113
13
(ii)
115
13
(iii)
97
11
(iv)
43
5
(v)
111
13
Question
25
25.
Given the mean of
10
samples as
7
1
5
,
what is the new mean if two samples
3
and
10
are added ?
(i)
83
12
(ii)
71
10
(iii)
99
14
(iv)
29
4
(v)
85
12
Question
26
26.
Given the mean of
12
samples as
5
1
2
,
what is the new mean if two samples
10
and
6
are removed ?
(i)
5
(ii)
8
(iii)
4
(iv)
6
(v)
3
Question
27
27.
The arithmetic mean of a + 2, a, and a - 2 is
(i)
3a
(ii)
a
(iii)
a - 2
(iv)
a + 2
Question
28
28.
The arithmetic mean of
38
13
39
12
26
7
is
(i)
24.5
(ii)
21.5
(iii)
23.5
(iv)
20.5
(v)
22.5
Question
29
29.
If the mean of
5
samples is
22
1
5
,
what is the new mean if
4
is added to each number.
(i)
79
3
(ii)
129
5
(iii)
131
5
(iv)
183
7
(v)
133
5
Question
30
30.
If the mean of
7
samples is
24
,
what is the new mean if
3
is subtracted from each number.
(i)
18
(ii)
20
(iii)
22
(iv)
21
(v)
23
Question
31
31.
If the mean of
8
samples is
28
1
8
,
what is the new mean if each number is multiplied by
8
.
(i)
227
(ii)
222
(iii)
225
(iv)
224
(v)
226
Question
32
32.
The mean of
6
numbers is
7
.
Upon
excluding
one number,
the mean becomes
7
1
5
.
Find the
excluded
number.
(i)
6
(ii)
5
(iii)
9
(iv)
3
(v)
7
Question
33
33.
The mean of
6
numbers is
10
5
6
.
Upon
adding
one number,
the mean becomes
10
3
7
.
Find the
included
number.
(i)
8
(ii)
6
(iii)
9
(iv)
10
(v)
7
Assignment Key
1) (iv)
2) (i)
3) (v)
4) (iii)
5) (iii)
6) (iv)
7) (ii)
8) (i)
9) (ii)
10) (ii)
11) (iv)
12) (v)
13) (ii)
14) (iv)
15) (iv)
16) (v)
17) (iv)
18) (iii)
19) (i)
20) (v)
21) (iii)
22) (v)
23) (i)
24) (i)
25) (v)
26) (i)
27) (ii)
28) (v)
29) (iii)
30) (iv)
31) (iii)
32) (i)
33) (i)
