In a medical examination of students of a class, the following blood groups are recorded:
Blood group
A
AB
B
O
No of student
10
13
12
5
A student is selected at random from the class. The probability that he/she has
blood group B is :

\frac{1}{4}

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\frac{13}{40}

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\frac{3}{10}

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\frac{1}{8}

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Solution

The correct option is C $\frac{3}{10}$
$p r o b (B b l o o d g r o u p) = \frac{12}{40} = \frac{3}{10}$

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Similar questions

In a medical examination of students of a class, the following blood groups are recorded:

Blood group A AB B O

No. of students 10 13 12 5

A student is selected at random from the class. Find the probability that he/she has blood group B.

Question 27
In a medical examination of students of a class, the following blood groups are recorded.

$\begin{matrix} Blood group & A & A B & B & O Number of & 10 & 13 & 12 & 5 students \end{matrix}$

A student is selected at random from the class. The probability that he/she has blood group B is:

A) $\frac{1}{4}$
B) $\frac{13}{40}$
C) $\frac{3}{10}$
D) $\frac{1}{8}$