ICSE Board Practice

Class VI Class VII Class VIII Class IX Class X
ICSE Grade VIII - Statistics
Question 1
1.
    • The daily wages of
    • 140
    • workers in a factory are given below.
    • Find the
    • mean wage.
    • Wage (in rupees)
      30 - 38
      38 - 46
      46 - 54
      54 - 62
      62 - 70
      70 - 78
      No. of workers
      12
      29
      27
      21
      28
      23
  • ₹
    55.37
  • ₹
    55.31
  • ₹
    55.34
  • ₹
    56.31
  • ₹
    57.31
Question 2
2.
    • Given an even number of random samples with the middle two samples as
    • x +
    • 17
    • and x +
    • 23
    • and the median as
    • 30
    • ,
    • find the value of x.
  • 12
  • 10
  • 9
  • 8
  • 11
Question 3
3.
    • Rainfall of 11 days (in mm) are given below. Find the mode rainfall.
      • 6
      • 12
      • 11
      • 11
      • 12
      • 12
      • 12
      • 5
      • 13
      • 6
      • 12
  • 12
    mm
  • 13
    mm
  • 11
    mm
  • 10
    mm
  • 14
    mm
Question 4
4.
    • If some random sample data is arranged in a frequency distribution table in
    • exclusive form
    • with
    • 2
    • -
    • 10
    • as the first class,
    • then the observation
    • 23
    • falls in which class?
  • 18
    -
    26
  • 17.5
    -
    26.5
  • 19
    -
    27
  • 18.5
    -
    25.5
  • 17
    -
    25
Question 5
5.
    • If the upper and lower limit of class interval are 31 and 29 respectively, then the class interval is
  • 29
    -
    31
  • 28.5
    -
    31
  • 29.5
    -
    30.5
  • 28.5
    -
    31.5
  • 29
    -
    31.5
Question 6
6.
On a certain day, the temperature in a city was recorded as shown below. Find the time that has 28 °C temperature.
  • 9 a.m.
  • 5 p.m.
  • 7 a.m.
  • 3 p.m.
  • 11 a.m.
Question 7
7.
    • Given the sample data, prepare the class interval table in
    • inclusive
    • form with
    • 1
    • as min value and a class size of
    • 10
    • .
      • 2
      • 39
      • 34
      • 34
      • 8
      • 15
      • 13
      • 25
      • 47
      • 30
      • 27
      • 32
      • 1
      • 29
      • 36
      • 39
      • 8
      • 23
      • 28
  • Class-Interval
    1 - 10
    11 - 20
    21 - 30
    31 - 40
    41 - 50
    Frequency
    4
    6
    2
    6
    1
  • Class-Interval
    1 - 11
    11 - 21
    21 - 31
    31 - 41
    41 - 51
    Frequency
    4
    2
    6
    6
    1
  • Class-Interval
    1 - 10
    11 - 20
    21 - 30
    31 - 40
    41 - 50
    Frequency
    4
    1
    6
    6
    2
  • Class-Interval
    1 - 10
    11 - 20
    21 - 30
    31 - 40
    41 - 50
    Frequency
    4
    5
    6
    6
    1
  • Class-Interval
    1 - 10
    11 - 20
    21 - 30
    31 - 40
    41 - 50
    Frequency
    4
    2
    6
    6
    1
Question 8
8.
    • Scores of 15 students are given below. Find the mean.
    • Score
      70
      71
      76
      79
      83
      84
      88
      90
      No. of students
      3
      2
      1
      3
      1
      3
      1
      1
  • 236
    3
  • 393
    5
  • 1178
    15
  • 1193
    15
  • 1208
    15
Question 9
9.
    • Weights of 20 students are given below. Find the mean.
    • Weight (in kg)
      40
      42
      43
      45
      46
      48
      49
      50
      55
      58
      No. of students
      2
      1
      2
      2
      2
      2
      3
      2
      2
      2
  • 961
    20
    kg
  • 979
    20
    kg
  • 959
    20
    kg
  • 48
    kg
  • 999
    20
    kg
Question 10
10.
    • If the mean of
    • 4
    • samples is
    • 24
      1
      2
    • ,
    • what is the new mean if
    • 4
    • is added to each number.
  • 29
  • 57
    2
  • 55
    2
  • 113
    4
  • 59
    2