the table below gives the probability density for blood types in a population. blood type o a b ab…

the table below gives the probability density for blood types in a population. blood type o a b ab probability 0.49 0.27 0.20 0.04 if a person is selected at random, what is the probability that their blood type is a or ab? p = ?

the table below gives the probability density for blood types in a population. blood type o a b ab probability 0.49 0.27 0.20 0.04 if a person is selected at random, what is the probability that their blood type is a or ab? p = ?

Answer

Explanation:

Step1: Identify relevant probabilities

The probability of blood - type A is $P(A)=0.27$ and the probability of blood - type AB is $P(AB)=0.04$.

Step2: Use addition rule for mutually - exclusive events

Since a person cannot have both blood - type A and blood - type AB at the same time (mutually exclusive events), the probability of A or AB is $P(A\cup AB)=P(A)+P(AB)$. $P(A\cup AB)=0.27 + 0.04$

Answer:

$0.31$