EduSahara™ Assignment
Name : Mean of Raw Data
Chapter : Statistics
Grade : CBSE Grade IX
License : Non Commercial Use
Question
1
1.
If the mean of
6
4
9
x
1
5
7
is
5
5
7
,
find the value of x.
(i)
7
(ii)
9
(iii)
8
(iv)
11
(v)
5
Question
2
2.
The mean of the below random sample is
30
4
5
.
Find the missing quantity.
44
36
19
40
17
25
x
36
30
12
(i)
48
(ii)
52
(iii)
49
(iv)
50
(v)
46
Question
3
3.
Given the mean of
12
samples as
10
5
6
,
what is the mean if a sample value is
increased
by
12
?
(i)
23
2
(ii)
73
6
(iii)
93
8
(iv)
71
6
(v)
49
4
Question
4
4.
Given the mean of
8
samples as
9
1
8
,
what is the mean if a sample value is
decreased
by
17
?
(i)
4
(ii)
8
(iii)
9
(iv)
6
(v)
7
Question
5
5.
Given the mean of
10
samples as
5
3
10
,
what is the new mean if two samples
10
and
6
are added ?
(i)
13
2
(ii)
25
4
(iii)
21
4
(iv)
23
4
(v)
11
2
Question
6
6.
Given the mean of
12
samples as
5
1
3
,
what is the new mean if two samples
10
and
1
are removed ?
(i)
53
10
(ii)
43
8
(iii)
21
4
(iv)
51
10
(v)
11
2
Question
7
7.
Find the mean of all prime numbers between 40 and 100.
(i)
731
11
(ii)
865
13
(iii)
199
3
(iv)
863
13
(v)
861
13
Question
8
8.
Find the mean of all prime numbers between 30 and 60.
(i)
311
7
(ii)
309
7
(iii)
133
3
(iv)
223
5
(v)
313
7
Question
9
9.
Find the mean of first 5 multiples of 12.
(i)
33
(ii)
37
(iii)
39
(iv)
36
(v)
35
Question
10
10.
Find the mean of first 7 whole numbers.
(i)
3
(ii)
4
(iii)
1
(iv)
6
(v)
2
Question
11
11.
Find the mean of first 10 multiples of 9.
(i)
97
2
(ii)
50
(iii)
101
2
(iv)
99
2
(v)
197
4
Question
12
12.
Find the mean of the first 20 odd numbers.
(i)
17
(ii)
20
(iii)
22
(iv)
21
(v)
19
Question
13
13.
Find the mean of the first 15 even numbers.
(i)
17
(ii)
18
(iii)
15
(iv)
16
(v)
13
Question
14
14.
The marks obtained by 14 students in a test are given below. Find their mean marks.
22
43
8
21
43
4
43
27
25
30
20
19
42
47
(i)
141
5
(ii)
197
7
(iii)
195
7
(iv)
253
9
(v)
199
7
Question
15
15.
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 10.
32
28
24
42
28
40
4
41
47
25
18
(i)
441
11
(ii)
517
13
(iii)
361
9
(iv)
439
11
(v)
437
11
Question
16
16.
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 6.
30
45
46
6
29
4
14
26
21
13
50
10
25
41
(i)
176
9
(ii)
138
7
(iii)
20
(iv)
136
7
Question
17
17.
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 doubled.
15
27
8
44
31
39
16
46
13
46
42
47
(i)
311
5
(ii)
185
3
(iii)
63
(iv)
187
3
Question
18
18.
Heights of 10 students (in cm) are given below. Find the mean height.
154
141
164
136
172
143
168
132
151
172
(i)
767
5
cm
(ii)
1543
10
cm
(iii)
307
2
cm
(iv)
1533
10
cm
(v)
1553
10
cm
Question
19
19.
Heights of 14 plants (in cm) are given below. Find the mean height.
58
87
100
82
74
86
54
74
68
87
92
70
76
87
(i)
1097
14
cm
(ii)
1123
14
cm
(iii)
548
7
cm
(iv)
1109
14
cm
(v)
1095
14
cm
Question
20
20.
Ages of 14 students (in years) are given below. Find the mean age.
14
15
12
15
13
15
11
11
11
15
11
15
11
12
(i)
13
years
(ii)
195
14
years
(iii)
183
14
years
(iv)
181
14
years
(v)
209
14
years
Question
21
21.
Rainfall of 11 days (in mm) are given below. Find the mean rainfall.
15
9
12
6
11
14
8
11
13
7
11
(i)
117
11
mm
(ii)
128
11
mm
(iii)
119
11
mm
(iv)
139
11
mm
(v)
118
11
mm
Question
22
22.
Scores of 12 students are given below. Find the mean score.
70
83
84
80
75
85
79
76
80
83
79
75
(i)
949
12
(ii)
961
12
(iii)
973
12
(iv)
475
6
(v)
317
4
Question
23
23.
Temperatures of 14 days (in °C) are given below. Find the mean temperature.
28
31
34
27
26
34
34
25
27
33
29
27
28
31
(i)
207
7
°C
(ii)
221
7
°C
(iii)
209
7
°C
(iv)
208
7
°C
(v)
214
7
°C
Question
24
24.
Weights of 15 students (in kg) are given below. Find the mean weight.
60
46
50
50
51
57
60
58
44
47
51
52
59
54
50
(i)
53
kg
(ii)
263
5
kg
(iii)
264
5
kg
(iv)
268
5
kg
(v)
273
5
kg
Question
25
25.
Daily wages of 11 labourers (in ₹) are given below. Find the mean wage.
457
430
494
414
469
385
348
483
474
358
442
(i)
₹
433.18
(ii)
₹
432.27
(iii)
₹
434.18
(iv)
₹
432.36
(v)
₹
432.18
Question
26
26.
The arithmetic mean of a + 2, a, and a - 2 is
(i)
a + 2
(ii)
a
(iii)
3a
(iv)
a - 2
Question
27
27.
If the mean of
8
samples is
28
5
8
,
what is the new mean if
5
is added to each number.
(i)
269
8
(ii)
203
6
(iii)
267
8
(iv)
271
8
(v)
67
2
Question
28
28.
If the mean of
4
samples is
26
1
2
,
what is the new mean if
9
is subtracted from each number.
(i)
69
4
(ii)
37
2
(iii)
18
(iv)
33
2
(v)
35
2
Question
29
29.
If the mean of
6
samples is
18
5
6
,
what is the new mean if each number is multiplied by
9
.
(i)
341
2
(ii)
170
(iii)
677
4
(iv)
339
2
(v)
337
2
Question
30
30.
The mean of
9
numbers is
12
.
Upon
excluding
one number,
the mean becomes
11
5
8
.
Find the
excluded
number.
(i)
15
(ii)
16
(iii)
14
(iv)
17
(v)
13
Question
31
31.
The mean of
7
numbers is
10
4
7
.
Upon
adding
one number,
the mean becomes
11
.
Find the
included
number.
(i)
15
(ii)
13
(iii)
12
(iv)
14
(v)
17
Question
32
32.
The scores obtained by 12 students in a test are given below. Find the mean score.
17
4
8
17
12
16
19
11
20
9
3
5
(i)
11
1
2
(ii)
3
(iii)
20
(iv)
17
(v)
11
3
4
Question
33
33.
The arithmetic mean of
38
24
36
31
21
38
is
(i)
29.33
(ii)
32.33
(iii)
33.33
(iv)
31.33
(v)
30.33
Assignment Key
1) (iii)
2) (iii)
3) (iv)
4) (v)
5) (iv)
6) (i)
7) (iv)
8) (i)
9) (iv)
10) (i)
11) (iv)
12) (ii)
13) (iv)
14) (ii)
15) (iv)
16) (ii)
17) (iv)
18) (iv)
19) (v)
20) (iv)
21) (i)
22) (i)
23) (i)
24) (ii)
25) (v)
26) (ii)
27) (i)
28) (v)
29) (iv)
30) (i)
31) (iv)
32) (v)
33) (iv)
