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.
3
3
14
20
17
10
(i)
3
(ii)
20
(iii)
17
(iv)
11
1
6
(v)
12
Question
2
2.
Find the mean of all prime numbers between 20 and 60.
(i)
41
(ii)
201
5
(iii)
119
3
(iv)
121
3
Question
3
3.
Find the mean of all prime numbers between 50 and 90.
(i)
775
11
(ii)
495
7
(iii)
635
9
(iv)
637
9
(v)
211
3
Question
4
4.
Find the mean of first 6 multiples of 6.
(i)
19
(ii)
22
(iii)
24
(iv)
21
(v)
20
Question
5
5.
Find the mean of first 7 whole numbers.
(i)
4
(ii)
1
(iii)
3
(iv)
2
(v)
5
Question
6
6.
Find the mean of first 10 multiples of 18.
(i)
97
(ii)
99
(iii)
98
(iv)
101
(v)
100
Question
7
7.
Find the mean of the first 15 odd numbers.
(i)
13
(ii)
18
(iii)
15
(iv)
16
(v)
14
Question
8
8.
Find the mean of the first 10 even numbers.
(i)
8
(ii)
10
(iii)
11
(iv)
14
(v)
12
Question
9
9.
The marks obtained by 13 students in a test are given below. Find their mean marks.
4
26
14
49
41
36
13
17
43
6
2
16
23
(i)
290
13
(ii)
288
13
(iii)
334
15
(iv)
292
13
(v)
246
11
Question
10
10.
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.
21
44
40
35
48
18
26
45
27
18
5
28
44
24
44
(i)
544
15
(ii)
470
13
(iii)
542
15
(iv)
614
17
(v)
36
Question
11
11.
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 decreased by 4.
20
30
24
27
2
11
31
33
34
26
32
14
15
(i)
20
(ii)
22
(iii)
19
(iv)
18
(v)
16
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.
44
27
16
30
49
7
48
46
18
1
(i)
286
5
(ii)
288
5
(iii)
400
7
(iv)
172
3
(v)
284
5
Question
13
13.
Heights of 13 students (in cm) are given below. Find the mean height.
149
129
140
165
168
163
143
173
135
134
166
173
174
(i)
2013
13
cm
(ii)
2038
13
cm
(iii)
2025
13
cm
(iv)
2012
13
cm
(v)
2014
13
cm
Question
14
14.
Heights of 10 plants (in cm) are given below. Find the mean height.
75
51
79
75
80
83
71
90
71
60
(i)
147
2
cm
(ii)
74
cm
(iii)
151
2
cm
(iv)
149
2
cm
Question
15
15.
Ages of 13 students (in years) are given below. Find the mean age.
10
10
12
12
13
12
10
11
13
12
14
13
12
(i)
12
years
(ii)
154
13
years
(iii)
155
13
years
(iv)
167
13
years
(v)
180
13
years
Question
16
16.
Rainfall of 11 days (in mm) are given below. Find the mean rainfall.
9
14
11
13
14
11
6
6
8
14
6
(i)
134
11
mm
(ii)
113
11
mm
(iii)
112
11
mm
(iv)
114
11
mm
(v)
123
11
mm
Question
17
17.
Scores of 14 students are given below. Find the mean score.
82
79
83
89
86
73
72
84
75
75
79
74
75
74
(i)
551
7
(ii)
557
7
(iii)
564
7
(iv)
552
7
(v)
550
7
Question
18
18.
Temperatures of 14 days (in °C) are given below. Find the mean temperature.
34
26
27
34
28
27
28
27
27
31
31
31
35
28
(i)
207
7
°C
(ii)
214
7
°C
(iii)
209
7
°C
(iv)
208
7
°C
(v)
221
7
°C
Question
19
19.
Weights of 14 students (in kg) are given below. Find the mean weight.
46
50
54
53
47
48
46
52
52
43
40
43
60
50
(i)
49
kg
(ii)
344
7
kg
(iii)
349
7
kg
(iv)
342
7
kg
(v)
356
7
kg
Question
20
20.
Daily wages of 11 labourers (in ₹) are given below. Find the mean wage.
366
301
401
348
326
347
409
407
440
473
478
(i)
₹
390.55
(ii)
₹
392.55
(iii)
₹
390.73
(iv)
₹
390.64
(v)
₹
391.55
Question
21
21.
If the mean of
5
8
7
x
6
4
3
is
5
,
find the value of x.
(i)
1
(ii)
-1
(iii)
4
(iv)
3
(v)
2
Question
22
22.
The mean of the below random sample is
30
7
10
.
Find the missing quantity.
47
31
x
10
36
19
34
42
20
18
(i)
48
(ii)
50
(iii)
51
(iv)
49
(v)
52
Question
23
23.
Given the mean of
13
samples as
8
7
13
,
what is the mean if a sample value is
increased
by
11
?
(i)
104
11
(ii)
28
3
(iii)
124
13
(iv)
120
13
(v)
122
13
Question
24
24.
Given the mean of
11
samples as
11
,
what is the mean if a sample value is
decreased
by
12
?
(i)
127
13
(ii)
91
9
(iii)
107
11
(iv)
109
11
(v)
111
11
Question
25
25.
Given the mean of
10
samples as
5
1
2
,
what is the new mean if two samples
8
and
6
are added ?
(i)
13
2
(ii)
23
4
(iii)
11
2
(iv)
25
4
(v)
21
4
Question
26
26.
Given the mean of
12
samples as
6
11
12
,
what is the new mean if two samples
4
and
8
are removed ?
(i)
85
12
(ii)
57
8
(iii)
71
10
(iv)
73
10
(v)
69
10
Question
27
27.
The arithmetic mean of a + 2, a, and a - 2 is
(i)
a
(ii)
3a
(iii)
a + 2
(iv)
a - 2
Question
28
28.
The arithmetic mean of
2
22
10
44
49
11
33
44
is
(i)
28.88
(ii)
26.88
(iii)
25.88
(iv)
27.88
(v)
24.88
Question
29
29.
If the mean of
8
samples is
31
1
8
,
what is the new mean if
6
is added to each number.
(i)
371
10
(ii)
295
8
(iii)
299
8
(iv)
223
6
(v)
297
8
Question
30
30.
If the mean of
7
samples is
19
5
7
,
what is the new mean if
10
is subtracted from each number.
(i)
66
7
(ii)
68
7
(iii)
10
(iv)
86
9
Question
31
31.
If the mean of
6
samples is
32
1
6
,
what is the new mean if each number is multiplied by
9
.
(i)
290
(ii)
1157
4
(iii)
577
2
(iv)
581
2
(v)
579
2
Question
32
32.
The mean of
8
numbers is
10
1
8
.
Upon
excluding
one number,
the mean becomes
10
4
7
.
Find the
excluded
number.
(i)
7
(ii)
4
(iii)
6
(iv)
8
(v)
9
Question
33
33.
The mean of
5
numbers is
9
2
5
.
Upon
adding
one number,
the mean becomes
8
1
6
.
Find the
included
number.
(i)
2
(ii)
1
(iii)
3
(iv)
5
(v)
-1
Assignment Key
1) (iv)
2) (iv)
3) (iii)
4) (iv)
5) (iii)
6) (ii)
7) (iii)
8) (iii)
9) (i)
10) (iii)
11) (iii)
12) (i)
13) (iv)
14) (i)
15) (ii)
16) (iii)
17) (v)
18) (i)
19) (iv)
20) (i)
21) (v)
22) (ii)
23) (v)
24) (iv)
25) (ii)
26) (iii)
27) (i)
28) (ii)
29) (v)
30) (ii)
31) (v)
32) (i)
33) (i)
