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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
    $5$
  • ✓
    $9$
✓

Answer

Correct option: D.
$9$

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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