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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