Question

The blood group of 30 students of class VIII are recorded as follows:
A,B,O,O,AB,OA,O,B,A,O,B,A,O,O,A,AB,O,A,A,O,O,AB,B,A,O,B,A,B,O
Represent this data in the form of a frequency distribution table. Which is most common and which is the rarest blood group among these students?

Answer 1

Hint: For making the table, we need to count the number of students falling in each blood group category. Blood group with the maximum number of students is the most common and with minimum structure is the rarest.

Complete step-by-step answer:
A frequency distribution is a representation, either in a graphical or tabular format, that displays the number of observations within a given interval. The interval size depends on the data being analyzed and the goals of the analyst. The intervals must be mutually exclusive and exhaustive.

Count the number of students in each blood group category and jot it.

Blood group	Tally	Students
A	|||| ||||	9
B	|||| |	6
AB	|||	3
O	|||| |||| ||	12

 This is the frequency distribution table for the given data.
The data is structured in tabular format for better organisation and understanding of the discrete data.
Blood group with maximum students = most common blood group
=0
Blood group with minimum students = Rarest blood group
=AB
⟹ Therefore, O is the most common and AB is the rarest blood group among the given students.

Note: Number of students / variables is also referred to as frequency.
 Distribution table helps to identify the number of times anything is occurring. It has various practical applications.