Question

The blood groups of $36$ students of IX class are recorded as follows.

$A$	$O$	$A$	$O$	$A$	$B$	$O$	$A$	$B$	$A$	$B$	$O$
$B$	$O$	$B$	$O$	$O$	$A$	$B$	$O$	$B$	$AB$	$O$	$A$
$O$	$O$	$O$	$A$	$AB$	$O$	$A$	$B$	$O$	$A$	$O$	$B$

Represent the data in the form of a frequency distribution table. Which is the most common and which is the rarest blood group among these students?

Answer 1

Blood groups A B AB O

Frequency (f) 10 9 2 15

Most common blood group is O

Rarest blood group is AB