Question

the probability of an individual having type o blood is 0.45. what is the probability of having a blood type other than o?
0.45
-0.45
0.55
-0.55
0.20

Explanation:

Step1: Recall probability rule

The sum of probabilities of all possible outcomes is 1. Let $P(O)$ be the probability of having Type - O blood and $P(\text{not }O)$ be the probability of having a blood - type other than O. So $P(O)+P(\text{not }O)=1$.

Step2: Solve for $P(\text{not }O)$

We know that $P(O) = 0.45$. Then $P(\text{not }O)=1 - P(O)$. Substitute $P(O)=0.45$ into the formula: $P(\text{not }O)=1 - 0.45=0.55$.

Answer:

C. 0.55