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Statistics — Maths STD 9 — Question

Gujarat BoardEnglish MediumSTD 9MathsStatistics1 Mark
MCQ
Less than' cumulative frequency table for a given data is as follows. Then, the frequency of class interval 20-30 is:
Marks
Less than 10
Less than 20
Less than 300
Less than 40
Cumulative frequency
3
17
37
92
  • A
    34
  • B
    55
  • C
    14
  • D
    20
✓

Answer

  1. 20

Solution:

A cumulative frequency distribution is the sum of the class and all classes below it in a frequency distribution.

Less than 30 has the class interval 20-30. Frequency of this class interval will be corresponding to

Marks
Cumulative Frequency
Class
Frequency
Less than 10
3
1-10
3
Less than 20
17
10-20
14
Less than 30
37
20-30
20
Less than 40
92
30-40
55

37 - 17 = 20

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