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Question

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


Solution

The data is represented in form of a frequency distribution table by listing each type of observation and its occurrence/frequency in the data set.

The frequency distribution table is shown below for the given data.

Most common blood group $=$ Highest frequency of the blood group $=O$ ($12$ students)

Rarest blood group $=$ Least frequency of the blood group $=AB$ ($3$ students)


Mathematics
NCERT
Standard IX

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