Question

The blood groups of $30$ students are recorded as follows: $A,B,O,A,AB,O,A,O,B,A,O,B,A,AB,B,A,AB,B,A,A,O,A,AB,B,A,O,B,A,B,A$

Prepare a frequency distribution table for the data.

Answer 1

A frequency distribution is a representation, either in a graphical or tabular format, that displays the number of observations within a given interval.

It can be observed that $12$students have their blood group as$A$, $8$as $B$, $4$as$AB$, and$6$ as $O$

Therefore the blood group of $30$students of the class can be represented as follows:

Blood group	Tally marks	Frequency
$A$	$\cancel{\left|\right|\left|\right|}\cancel{\left|\right|\left|\right|}\left|\right|$	$12$
$B$	$\cancel{\left|\right|\left|\right|}\left|\right||$	$8$
$AB$	$\left|\right|\left|\right|$	$4$
$O$	$\cancel{\left|\right|\left|\right|}|$	$6$
Total		$30$

Hence, the frequency distribution table for the data is the above table.