Below is the distribution of "more than" type of marks obtained by $50$ students in a $100$ marks examination. Prepare the grouped frequency distribution from that.
Obtained marks No. of Students
$0$ or more than $0$ $50$
$20$ or more than $20$ $48$
$40$ or more than $40$ $40$
$60$ or more than $60$ $31$
$80$ or more than $80$ $10$

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To prepare the grouped frequency distribution,we calculate the frequency for each class interval by subtracting the number of students in the higher range from the lower range.
$1$. For $0-20$: $50 - 48 = 2$
$2$. For $20-40$: $48 - 40 = 8$
$3$. For $40-60$: $40 - 31 = 9$
$4$. For $60-80$: $31 - 10 = 21$
$5$. For $80-100$: Since there are $10$ students who scored $80$ or more,and the total is $50$,the frequency for $80-100$ is $10$.
Marks obtained (Class) $0-20$ $20-40$ $40-60$ $60-80$ $80-100$
No. of students (Frequency) $2$ $8$ $9$ $21$ $10$

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Represent the data given above by a grouped frequency distribution table,taking the class intervals as $0-10, 10-20, \dots$ etc.

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