EduSahara™ Assignment
Name : Mean of Raw Data
Chapter : Statistics
Grade : CBSE Grade IX
License : Non Commercial Use
Question
1
1.
If the mean of
5
9
x
4
2
is
5
2
5
,
find the value of x.
(i)
7
(ii)
9
(iii)
4
(iv)
8
(v)
6
Question
2
2.
The mean of the below random sample is
29
3
10
.
Find the missing quantity.
25
29
41
13
x
46
22
36
44
15
(i)
23
(ii)
21
(iii)
25
(iv)
19
(v)
22
Question
3
3.
Given the mean of
7
samples as
10
5
7
,
what is the mean if a sample value is
increased
by
14
?
(i)
87
7
(ii)
89
7
(iii)
113
9
(iv)
13
Question
4
4.
Given the mean of
11
samples as
10
5
11
,
what is the mean if a sample value is
decreased
by
16
?
(i)
9
(ii)
8
(iii)
12
(iv)
7
(v)
10
Question
5
5.
Given the mean of
10
samples as
5
2
5
,
what is the new mean if two samples
4
and
5
are added ?
(i)
21
4
(ii)
11
2
(iii)
19
4
(iv)
31
6
(v)
23
4
Question
6
6.
Given the mean of
12
samples as
5
1
3
,
what is the new mean if two samples
9
and
6
are removed ?
(i)
47
10
(ii)
49
10
(iii)
41
8
(iv)
51
10
(v)
19
4
Question
7
7.
Find the mean of all prime numbers between 40 and 60.
(i)
339
7
(ii)
243
5
(iii)
49
(iv)
241
5
Question
8
8.
Find the mean of all prime numbers between 10 and 90.
(i)
189
4
(ii)
95
2
(iii)
471
10
(iv)
379
8
(v)
473
10
Question
9
9.
Find the mean of first 8 multiples of 8.
(i)
36
(ii)
35
(iii)
39
(iv)
37
(v)
33
Question
10
10.
Find the mean of first 5 whole numbers.
(i)
1
(ii)
2
(iii)
5
(iv)
0
(v)
3
Question
11
11.
Find the mean of first 8 multiples of 19.
(i)
341
4
(ii)
86
(iii)
173
2
(iv)
171
2
(v)
169
2
Question
12
12.
Find the mean of the first 10 odd numbers.
(i)
9
(ii)
10
(iii)
11
(iv)
12
(v)
8
Question
13
13.
Find the mean of the first 20 even numbers.
(i)
22
(ii)
23
(iii)
21
(iv)
20
(v)
18
Question
14
14.
The marks obtained by 13 students in a test are given below. Find their mean marks.
6
20
21
9
33
35
37
11
7
38
6
10
13
(i)
94
5
(ii)
248
13
(iii)
246
13
(iv)
244
13
(v)
210
11
Question
15
15.
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 9.
4
15
17
29
41
37
6
15
20
44
49
50
(i)
143
4
(ii)
147
4
(iii)
217
6
(iv)
73
2
(v)
145
4
Question
16
16.
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 3.
16
40
12
33
3
18
18
33
24
50
29
15
49
50
27
(i)
124
5
(ii)
122
5
(iii)
126
5
(iv)
172
7
(v)
76
3
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.
19
4
15
43
26
14
3
5
43
47
23
24
(i)
131
3
(ii)
221
5
(iii)
133
3
(iv)
45
Question
18
18.
Heights of 12 students (in cm) are given below. Find the mean height.
144
170
144
134
140
160
157
149
166
156
129
143
(i)
454
3
cm
(ii)
448
3
cm
(iii)
449
3
cm
(iv)
451
3
cm
(v)
150
cm
Question
19
19.
Heights of 10 plants (in cm) are given below. Find the mean height.
83
75
74
75
86
63
90
100
72
73
(i)
811
10
cm
(ii)
396
5
cm
(iii)
793
10
cm
(iv)
791
10
cm
(v)
801
10
cm
Question
20
20.
Ages of 13 students (in years) are given below. Find the mean age.
15
10
15
14
13
13
12
13
11
14
12
10
12
(i)
190
13
years
(ii)
177
13
years
(iii)
165
13
years
(iv)
164
13
years
(v)
166
13
years
Question
21
21.
Rainfall of 11 days (in mm) are given below. Find the mean rainfall.
14
12
15
15
12
6
15
7
13
7
15
(i)
142
11
mm
(ii)
131
11
mm
(iii)
133
11
mm
(iv)
12
mm
(v)
153
11
mm
Question
22
22.
Scores of 14 students are given below. Find the mean score.
88
72
90
75
81
84
76
72
87
87
70
87
86
87
(i)
571
7
(ii)
578
7
(iii)
573
7
(iv)
585
7
(v)
572
7
Question
23
23.
Temperatures of 15 days (in °C) are given below. Find the mean temperature.
27
33
31
33
33
26
33
30
31
35
26
29
34
28
25
(i)
91
3
°C
(ii)
454
15
°C
(iii)
484
15
°C
(iv)
152
5
°C
(v)
469
15
°C
Question
24
24.
Weights of 15 students (in kg) are given below. Find the mean weight.
40
56
48
48
56
47
41
45
43
44
51
52
55
48
50
(i)
754
15
kg
(ii)
739
15
kg
(iii)
724
15
kg
(iv)
242
5
kg
(v)
145
3
kg
Question
25
25.
Daily wages of 10 labourers (in ₹) are given below. Find the mean wage.
364
416
448
406
487
339
481
344
468
412
(i)
₹
417.00
(ii)
₹
417.50
(iii)
₹
416.50
(iv)
₹
418.50
Question
26
26.
The arithmetic mean of a + 2, a, and a - 2 is
(i)
a - 2
(ii)
3a
(iii)
a + 2
(iv)
a
Question
27
27.
If the mean of
8
samples is
21
5
8
,
what is the new mean if
4
is added to each number.
(i)
155
6
(ii)
203
8
(iii)
51
2
(iv)
205
8
(v)
207
8
Question
28
28.
If the mean of
4
samples is
20
1
4
,
what is the new mean if
4
is subtracted from each number.
(i)
97
6
(ii)
67
4
(iii)
63
4
(iv)
33
2
(v)
65
4
Question
29
29.
If the mean of
5
samples is
31
,
what is the new mean if each number is multiplied by
10
.
(i)
308
(ii)
311
(iii)
309
(iv)
310
(v)
312
Question
30
30.
The mean of
10
numbers is
13
4
5
.
Upon
excluding
one number,
the mean becomes
13
2
9
.
Find the
excluded
number.
(i)
19
(ii)
18
(iii)
20
(iv)
21
(v)
16
Question
31
31.
The mean of
10
numbers is
11
1
5
.
Upon
adding
one number,
the mean becomes
12
.
Find the
included
number.
(i)
21
(ii)
23
(iii)
18
(iv)
20
(v)
19
Question
32
32.
The scores obtained by 11 students in a test are given below. Find the mean score.
7
15
11
15
19
9
1
7
15
18
3
(i)
11
(ii)
1
(iii)
10
10
11
(iv)
15
(v)
18
Question
33
33.
The arithmetic mean of
49
38
33
11
39
40
is
(i)
35
(ii)
37
(iii)
33
(iv)
34
(v)
36
Assignment Key
1) (i)
2) (v)
3) (ii)
4) (i)
5) (i)
6) (ii)
7) (ii)
8) (v)
9) (i)
10) (ii)
11) (iv)
12) (ii)
13) (iii)
14) (iii)
15) (v)
16) (i)
17) (iii)
18) (ii)
19) (iv)
20) (iv)
21) (ii)
22) (i)
23) (ii)
24) (iii)
25) (iii)
26) (iv)
27) (iv)
28) (v)
29) (iv)
30) (i)
31) (iv)
32) (iii)
33) (i)
