CBSE Board Practice

Class VI Class VII Class VIII 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