Question

The blood groups of $200$ people is distributed as follows: $50$ have type A blood, $65$ have B blood type, $70$ have O blood type and $15$ have type AB blood. If a person from this group is selected at random, what is the probability that this person has O blood type?

• A. $\frac{65}{200}$
• B. $\frac{7}{20}$
• C. $\frac{1}{4}$
• D. $\frac{3}{40}$

Answer 1

Answer: (B)

$\frac{7}{20}$

Number of people have blood group A: $50$

Number of people have blood group B: $65$

Number of people have blood group O: $70$

Number of people have blood group AB: $15$

Total people: $200$

Required probability:

$P=\frac{70}{200}=\frac{7}{20}$