The blood groups of 30 students of class IX 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,
A student is selected at random from the class from blood donation. Find the probability that the blood group of the student chosen is A.


Given:

The blood groups of 30 students of class IX.

A student is selected at random from the class from blood donation. 

To do:

We have to find the probability that the blood group of the student chosen is A.

Solution:

Total number of students $=30$

Number of students whose blood group is A $=9$

We know that,

Probability of an event=$ \frac{Number \ of \ favourable \ outcomes}{Total \ number \ of \ outcomes}$

Therefore,

Probability that the blood group of the student chosen is A $=\frac{9}{30}$

$=0.3$

This implies,

The probability that the blood group of the student chosen is A is $0.3$.      

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Updated on: 10-Oct-2022

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