Question 27 In a medical examination of students of a class- the following blood groups are recorded- begin array - c - c - c - c - c -Whine Blood group - A - AB - B - O lllhline Number - of - 10 - 13 - 12 - 5 1 students - - - - II hhline array A student is selected at random from the class- The probability that he-she has blood group B is-A 1-4B 13-4C 3-10D 1-8

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Standard VIII

Mathematics

Calculating Probability of an Event

Question 27 I...

Question

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

$\begin{matrix} B l o o d g r o u p & A & A B & B & O N u m b e r o f & 10 & 13 & 12 & 5 s t u d e n t s \end{matrix}$

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) $\frac{1}{8}$

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Solution

The answer is C.
Total number of students in a medical examination, n(S) = 40
Number of persons who have B blood group, n(E) = 12
$∴$ Probability that he/she has blood group B $= \frac{n (E)}{n (S)} = \frac{12}{40} = \frac{3}{10}$

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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) $\frac{1}{8}$