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Statistics — Maths STD 9 — Question

Gujarat BoardEnglish MediumSTD 9MathsStatistics1 Mark
MCQ
More than’ cumulative frequency table for a given data is as follows: Then, the frequency of the class interval $70-80$ is:
Marks
More than $89$
More than $79$
More than $69$
More than $59$
Cumulative frequency
$8$
$18$
$30$
$65$
  • ✓
    $12$
  • B
    $35$
  • C
    $10$
  • D
    $22$
✓

Answer

Correct option: A.
$12$

A cumulative frequency distribution is the sum of the class and all classes below it in a frequency distribution.
Subtract cumulative frequency of class more than $70$ from the next cummulative Frequency of class more than $69$.
$30 − 18 = 12$

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