Question

In the sample of $50$ people, $21$ has type $"O"$ blood, $22$ has type $"A"$ blood, $5$ has type $"B"$ blood and $2$ has type $"AB"$ blood. If a person is selected at random find the probability that the person does not have type $"B"$ blood

• A. $\frac{9}{10}$
• B. $\frac{5}{10}$
• C. $\frac{3}{10}$
• D. None of these

Answer 1

The correct option is A $\frac{9}{10}$

$P$(does not have ${}^{\prime }{B}^{\prime }$ blood) $=\frac{TotalPersonHavin{g}^{\prime }{B}^{\prime }Blood}{Total}$ $=\frac{50-5}{50}=\frac{9}{10}$