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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:
 
More than
More than
More than
 
Marks
$89$
$79$
$69$
More than $59$
Cumulative frequency
$8$
$18$
$30$
$65$
  • ✓
    $12$
  • B
    $10$
  • C
    $22$
  • D
    $35$
✓

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 cumulative Frequency of class more than $69$.
$30 - 18 = 12$.

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