EduSahara™ Assignment
Name : Mean of Raw Data
Chapter : Statistics
Grade : SSC Grade IX
License : Non Commercial Use
Question
1
1.
The scores obtained by 14 students in a test are given below. Find the mean score.
18
7
12
13
11
4
11
17
16
16
19
10
13
12
(i)
12
11
14
(ii)
19
(iii)
12
1
2
(iv)
11
(v)
15
Question
2
2.
The marks obtained by 10 students in a test are given below. Find their mean marks.
24
8
39
3
41
17
7
10
29
1
(i)
179
10
(ii)
71
4
(iii)
181
10
(iv)
145
8
(v)
177
10
Question
3
3.
Heights of 13 students (in cm) are given below. Find the mean height.
139
174
159
134
126
141
125
154
131
164
157
133
162
(i)
1901
13
cm
(ii)
1899
13
cm
(iii)
1912
13
cm
(iv)
1900
13
cm
(v)
1925
13
cm
Question
4
4.
Heights of 15 plants (in cm) are given below. Find the mean height.
81
74
69
78
60
53
83
54
57
97
58
69
100
72
82
(i)
1117
15
cm
(ii)
1087
15
cm
(iii)
363
5
cm
(iv)
1102
15
cm
(v)
1088
15
cm
Question
5
5.
Ages of 11 students (in years) are given below. Find the mean age.
15
13
12
13
10
11
14
12
14
12
11
(i)
148
11
years
(ii)
138
11
years
(iii)
137
11
years
(iv)
159
11
years
(v)
139
11
years
Question
6
6.
Rainfall of 13 days (in mm) are given below. Find the mean rainfall.
12
13
12
8
13
11
15
5
13
6
5
12
8
(i)
133
13
mm
(ii)
146
13
mm
(iii)
135
13
mm
(iv)
134
13
mm
(v)
159
13
mm
Question
7
7.
Scores of 14 students are given below. Find the mean score.
73
76
87
70
76
89
75
90
73
76
82
77
77
72
(i)
1121
14
(ii)
1107
14
(iii)
1095
14
(iv)
1093
14
(v)
547
7
Question
8
8.
Temperatures of 13 days (in °C) are given below. Find the mean temperature.
26
34
26
27
29
25
30
28
35
33
33
32
34
(i)
392
13
°C
(ii)
394
13
°C
(iii)
393
13
°C
(iv)
418
13
°C
(v)
405
13
°C
Question
9
9.
Weights of 11 students (in kg) are given below. Find the mean weight.
59
52
60
60
53
49
56
41
47
44
48
(i)
580
11
kg
(ii)
569
11
kg
(iii)
571
11
kg
(iv)
570
11
kg
(v)
591
11
kg
Question
10
10.
Daily wages of 15 labourers (in ₹) are given below. Find the mean wage.
394
405
428
423
397
347
313
495
383
474
346
342
430
317
455
(i)
₹
396.80
(ii)
₹
398.60
(iii)
₹
396.60
(iv)
₹
397.00
(v)
₹
397.60
Question
11
11.
The arithmetic mean of
34
50
19
49
3
24
44
is
(i)
30.86
(ii)
33.86
(iii)
32.86
(iv)
31.86
(v)
29.86
Question
12
12.
If the mean of
4
5
x
3
7
is
5
,
find the value of x.
(i)
4
(ii)
5
(iii)
7
(iv)
6
(v)
9
Question
13
13.
The mean of the below random sample is
32
1
10
.
Find the missing quantity.
48
13
26
45
31
10
34
44
45
x
(i)
24
(ii)
25
(iii)
22
(iv)
27
(v)
26
Question
14
14.
Given the mean of
10
samples as
10
1
10
,
what is the mean if a sample value is
increased
by
13
?
(i)
35
3
(ii)
79
7
(iii)
11
(iv)
57
5
(v)
59
5
Question
15
15.
Given the mean of
11
samples as
12
5
11
,
what is the mean if a sample value is
decreased
by
18
?
(i)
139
13
(ii)
11
(iii)
119
11
(iv)
117
11
Question
16
16.
Given the mean of
10
samples as
7
1
5
,
what is the new mean if two samples
5
and
5
are added ?
(i)
43
6
(ii)
53
8
(iii)
13
2
(iv)
29
4
(v)
41
6
Question
17
17.
Given the mean of
12
samples as
5
1
6
,
what is the new mean if two samples
4
and
5
are removed ?
(i)
51
10
(ii)
43
8
(iii)
53
10
(iv)
21
4
(v)
11
2
Question
18
18.
Find the mean of all prime numbers between 40 and 90.
(i)
257
4
(ii)
385
6
(iii)
509
8
(iv)
127
2
(v)
383
6
Question
19
19.
Find the mean of all prime numbers between 40 and 90.
(i)
385
6
(ii)
127
2
(iii)
509
8
(iv)
383
6
(v)
257
4
Question
20
20.
Find the mean of first 8 multiples of 13.
(i)
233
4
(ii)
117
2
(iii)
115
2
(iv)
59
(v)
119
2
Question
21
21.
Find the mean of first 10 whole numbers.
(i)
7
2
(ii)
17
4
(iii)
11
2
(iv)
5
(v)
9
2
Question
22
22.
Find the mean of first 6 multiples of 2.
(i)
6
(ii)
9
(iii)
4
(iv)
7
(v)
8
Question
23
23.
Find the mean of the first 20 odd numbers.
(i)
17
(ii)
20
(iii)
21
(iv)
22
(v)
19
Question
24
24.
Find the mean of the first 10 even numbers.
(i)
9
(ii)
13
(iii)
11
(iv)
10
(v)
12
Question
25
25.
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 increased by 1.
44
40
42
49
18
42
31
11
22
26
(i)
67
2
(ii)
133
4
(iii)
69
2
(iv)
34
(v)
65
2
Question
26
26.
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 8.
13
4
21
14
46
49
11
11
50
19
41
20
16
18
(i)
221
14
(ii)
219
14
(iii)
191
12
(iv)
251
16
(v)
223
14
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.
7
42
2
31
42
47
43
6
7
5
14
5
11
20
(i)
40
(ii)
284
7
(iii)
362
9
(iv)
202
5
(v)
282
7
Question
28
28.
If the mean of
8
samples is
31
1
2
,
what is the new mean if each number is multiplied by
6
.
(i)
190
(ii)
189
(iii)
191
(iv)
188
(v)
187
Question
29
29.
The mean of
5
numbers is
11
.
Upon
excluding
one number,
the mean becomes
9
3
4
.
Find the
excluded
number.
(i)
15
(ii)
17
(iii)
18
(iv)
14
(v)
16
Question
30
30.
The mean of
9
numbers is
8
7
9
.
Upon
adding
one number,
the mean becomes
8
4
5
.
Find the
included
number.
(i)
9
(ii)
8
(iii)
12
(iv)
10
(v)
7
Assignment Key
1) (i)
2) (i)
3) (ii)
4) (ii)
5) (iii)
6) (i)
7) (iv)
8) (i)
9) (ii)
10) (iii)
11) (iv)
12) (iv)
13) (ii)
14) (iv)
15) (iii)
16) (v)
17) (iii)
18) (v)
19) (iv)
20) (ii)
21) (v)
22) (iv)
23) (ii)
24) (iii)
25) (i)
26) (i)
27) (v)
28) (ii)
29) (v)
30) (i)
