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Statistics — Maths STD 9 — Question

Gujarat BoardEnglish MediumSTD 9MathsStatistics1 Mark
MCQ
The given cumulative frequency distribution shows the class intervals and their corresponding cumulative frequencies. Then the frequency of class interval 20-30 is:
Class
10-20
20-30
30-40
Cumulative frequency
5
14
25
  • A
    11
  • B
    20
  • C
    5
  • D
    9
✓

Answer

  1. 9

Solution:

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

Subtract the previous cumulative frequency (c.f.) from the cumulative frequency of the current class.

So frequency of the class interval 20 - 30 is 14 - 5 = 9

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