EduSahara™ Assignment
Name : Mean of Raw Data
Chapter : Statistics
Grade : SSC Grade IX
License : Non Commercial Use
Question
1
1.
The scores obtained by 9 students in a test are given below. Find the mean score.
18
13
7
11
5
4
8
14
13
(i)
4
(ii)
14
(iii)
11
(iv)
18
(v)
10
1
3
Question
2
2.
The marks obtained by 13 students in a test are given below. Find their mean marks.
44
30
26
10
3
30
29
44
20
32
14
37
49
(i)
370
13
(ii)
366
13
(iii)
312
11
(iv)
424
15
(v)
368
13
Question
3
3.
Heights of 12 students (in cm) are given below. Find the mean height.
139
162
162
166
138
131
129
125
126
157
134
131
(i)
427
3
cm
(ii)
425
3
cm
(iii)
431
3
cm
(iv)
142
cm
(v)
428
3
cm
Question
4
4.
Heights of 10 plants (in cm) are given below. Find the mean height.
74
69
82
80
50
57
53
78
93
59
(i)
141
2
cm
(ii)
143
2
cm
(iii)
70
cm
(iv)
139
2
cm
Question
5
5.
Ages of 14 students (in years) are given below. Find the mean age.
12
15
14
14
14
12
12
12
11
10
15
10
11
12
(i)
101
7
years
(ii)
87
7
years
(iii)
88
7
years
(iv)
89
7
years
(v)
94
7
years
Question
6
6.
Rainfall of 12 days (in mm) are given below. Find the mean rainfall.
12
14
9
14
5
12
11
10
9
8
6
9
(i)
10
mm
(ii)
131
12
mm
(iii)
119
12
mm
(iv)
121
12
mm
(v)
143
12
mm
Question
7
7.
Scores of 12 students are given below. Find the mean score.
70
81
74
71
85
76
81
78
78
73
72
83
(i)
473
6
(ii)
77
(iii)
463
6
(iv)
461
6
(v)
467
6
Question
8
8.
Temperatures of 10 days (in °C) are given below. Find the mean temperature.
25
27
35
27
28
31
27
29
33
26
(i)
29
°C
(ii)
154
5
°C
(iii)
146
5
°C
(iv)
149
5
°C
(v)
144
5
°C
Question
9
9.
Weights of 14 students (in kg) are given below. Find the mean weight.
58
40
56
54
60
54
41
49
57
42
40
59
54
43
(i)
105
2
kg
(ii)
51
kg
(iii)
103
2
kg
(iv)
101
2
kg
Question
10
10.
Daily wages of 14 labourers (in ₹) are given below. Find the mean wage.
368
446
410
440
317
369
453
335
391
393
301
417
448
426
(i)
₹
395.86
(ii)
₹
394.14
(iii)
₹
394.86
(iv)
₹
394.00
(v)
₹
393.86
Question
11
11.
The arithmetic mean of
11
9
25
37
26
33
12
is
(i)
20.86
(ii)
21.86
(iii)
19.86
(iv)
22.86
(v)
23.86
Question
12
12.
If the mean of
7
6
10
1
x
2
3
5
is
4
3
4
,
find the value of x.
(i)
3
(ii)
6
(iii)
4
(iv)
2
(v)
5
Question
13
13.
The mean of the below random sample is
35
.
Find the missing quantity.
x
12
39
21
48
46
37
47
31
22
(i)
47
(ii)
48
(iii)
46
(iv)
50
(v)
44
Question
14
14.
Given the mean of
8
samples as
10
5
8
,
what is the mean if a sample value is
increased
by
19
?
(i)
14
(ii)
11
(iii)
13
(iv)
16
(v)
12
Question
15
15.
Given the mean of
5
samples as
10
3
5
,
what is the mean if a sample value is
decreased
by
14
?
(i)
53
7
(ii)
39
5
(iii)
25
3
(iv)
37
5
(v)
41
5
Question
16
16.
Given the mean of
10
samples as
5
,
what is the new mean if two samples
9
and
9
are added ?
(i)
17
3
(ii)
7
(iii)
19
3
(iv)
27
5
(v)
5
Question
17
17.
Given the mean of
12
samples as
4
2
3
,
what is the new mean if two samples
7
and
3
are removed ?
(i)
23
5
(ii)
31
7
(iii)
21
5
(iv)
5
Question
18
18.
Find the mean of all prime numbers between 40 and 90.
(i)
127
2
(ii)
383
6
(iii)
509
8
(iv)
385
6
(v)
257
4
Question
19
19.
Find the mean of all prime numbers between 10 and 100.
(i)
151
3
(ii)
49
(iii)
51
(iv)
247
5
(v)
149
3
Question
20
20.
Find the mean of first 8 multiples of 2.
(i)
7
(ii)
10
(iii)
12
(iv)
8
(v)
9
Question
21
21.
Find the mean of first 6 whole numbers.
(i)
3
(ii)
5
2
(iii)
9
4
(iv)
3
2
(v)
7
2
Question
22
22.
Find the mean of first 8 multiples of 11.
(i)
50
(ii)
101
2
(iii)
97
2
(iv)
197
4
(v)
99
2
Question
23
23.
Find the mean of the first 20 odd numbers.
(i)
21
(ii)
18
(iii)
22
(iv)
20
(v)
19
Question
24
24.
Find the mean of the first 10 even numbers.
(i)
14
(ii)
10
(iii)
11
(iv)
8
(v)
12
Question
25
25.
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 8.
19
43
33
8
27
15
19
30
23
35
1
33
(i)
63
2
(ii)
191
6
(iii)
129
4
(iv)
253
8
(v)
193
6
Question
26
26.
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.
2
5
37
40
46
46
47
43
28
17
2
5
41
(i)
307
13
(ii)
305
13
(iii)
261
11
(iv)
353
15
(v)
309
13
Question
27
27.
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 doubled.
42
26
19
17
41
50
49
43
11
34
2
29
40
2
(i)
173
3
(ii)
403
7
(iii)
407
7
(iv)
291
5
(v)
405
7
Question
28
28.
If the mean of
8
samples is
25
1
2
,
what is the new mean if each number is multiplied by
9
.
(i)
457
2
(ii)
461
2
(iii)
459
2
(iv)
917
4
(v)
230
Question
29
29.
The mean of
10
numbers is
13
1
5
.
Upon
excluding
one number,
the mean becomes
14
1
9
.
Find the
excluded
number.
(i)
3
(ii)
4
(iii)
7
(iv)
5
(v)
6
Question
30
30.
The mean of
10
numbers is
9
3
5
.
Upon
adding
one number,
the mean becomes
10
.
Find the
included
number.
(i)
12
(ii)
13
(iii)
14
(iv)
15
(v)
17
Assignment Key
1) (v)
2) (v)
3) (ii)
4) (iv)
5) (ii)
6) (iii)
7) (iv)
8) (v)
9) (iv)
10) (v)
11) (ii)
12) (iii)
13) (i)
14) (iii)
15) (ii)
16) (i)
17) (i)
18) (ii)
19) (v)
20) (v)
21) (ii)
22) (v)
23) (iv)
24) (iii)
25) (ii)
26) (i)
27) (v)
28) (iii)
29) (iv)
30) (iii)
