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Class VI
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Class IX
Class X
CBSE Grade IX - Statistics
Question
1
1.
In a study of heart patients, the following observations are obtained. Identify the class interval table for the given histogram.
Age (in years)
67 - 70
71 - 74
75 - 78
79 - 82
83 - 86
No. of Patients
34
50
53
41
10
Age (in years)
67 - 70
71 - 74
75 - 78
79 - 82
83 - 86
No. of Patients
34
48
50
41
10
Age (in years)
67 - 70
71 - 74
75 - 78
79 - 82
83 - 86
No. of Patients
34
10
48
41
50
Age (in years)
67 - 70
71 - 74
75 - 78
79 - 82
83 - 86
No. of Patients
34
45
48
41
10
Age (in years)
67 - 70
71 - 74
75 - 78
79 - 82
83 - 86
No. of Patients
34
50
48
41
10
Question
2
2.
Find the median of all prime numbers between 50 and 70.
63
57
59
61
60
Question
3
3.
Find the median of first 9 whole numbers.
4
5
3
2
7
Question
4
4.
Scores of 151 students are given below.
Identify the class interval table for the given histogram and frequency polygon on the same graph.
Score
72 - 77
77 - 82
82 - 87
87 - 92
92 - 97
97 - 102
102 - 107
No. of students
36
13
13
8
26
44
16
Score
72 - 77
77 - 82
82 - 87
87 - 92
92 - 97
97 - 102
102 - 107
No. of students
36
16
8
8
26
44
13
Score
72 - 77
77 - 82
82 - 87
87 - 92
92 - 97
97 - 102
102 - 107
No. of students
36
13
8
3
26
44
16
Score
72 - 77
77 - 82
82 - 87
87 - 92
92 - 97
97 - 102
102 - 107
No. of students
36
8
13
8
26
44
16
Score
72 - 77
77 - 82
82 - 87
87 - 92
92 - 97
97 - 102
102 - 107
No. of students
36
13
8
8
26
44
16
Question
5
5.
Ages of 16 students are given below. Find the mode.
Age (in years)
10
11
12
13
14
15
No. of students
2
6
3
2
1
2
12
years
13
years
11
years
9
years
10
years
Question
6
6.
If the lower and upper limit of class interval are 34 and 38 respectively, then the class interval is
34
-
38.5
34.5
-
37.5
33.5
-
38.5
34
-
38
33.5
-
38
Question
7
7.
Find the median of all the factors of 40.
7
13
2
15
2
11
2
25
4
Question
8
8.
The marks obtained by 11 students in a test are given below. Find their mode marks.
48
16
22
13
42
13
21
28
33
18
35
12
13
11
16
14
Question
9
9.
Heights of 11 students (in cm) are given below. Find the median height.
158
161
143
159
141
156
163
135
174
149
151
157
cm
156
cm
154
cm
155
cm
158
cm
Question
10
10.
Given below is the column-graph showing heights of some mountain peaks. Find the mountain that has minimum height.
Nanda Devi
Alps
Nanga Parbat
Kilimanjaro
Appalachian
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