The following table shows the blood groups of 40 students of a class- - Blood group A B O AB- Number of students 11 9 14 6- - One student of the class is chosen at random- What is the probability that the chosen studet has blood group i O- ii AB-

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Standard IX

Mathematics

Experimental/Empirical Probability

The following...

Question

The following table shows the blood groups of 40 students of a class.

$\begin{matrix} Blood group & A & B & O & A B Number of students & 11 & 9 & 14 & 6 \end{matrix}$

One student of the class is chosen at random. What is the probability that the chosen studet has blood group (i) O? (ii) AB?

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Solution

ANSWER:
Total number of students = 40
(i) Number of students with blood group O = 14
Let E 1 be the event that the selected student's blood group is O.
∴ Required probability = P ( E 1 ) = $\frac{14}{40}$ = 0.35
(ii) Number of students with blood group AB = 6
Let E 2 be the event that the selected student's blood group is AB.
∴ Required probability = P ( E 2 ) = $\frac{6}{40}$ = 0.15

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Q. The following table shows the blood groups of 40 students of a class.

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The following table shows the blood groups of 40 students of a class. Blood groupABOABNumber of students119146 One student of the class is chosen at random. What is the probability that the chosen studet has blood group (i) O? (ii) AB?

The following table shows the blood groups of 40 students of a class.

$\begin{matrix} Blood group & A & B & O & A B Number of students & 11 & 9 & 14 & 6 \end{matrix}$

One student of the class is chosen at random. What is the probability that the chosen studet has blood group (i) O? (ii) AB?