Question

0.45 0.40 0.11 This question uses the following probability model for the blood type of a randomly chosen person in the United States: Maria has type A blood. She can safely receive blood transfusions from people with blood types O and A. The probability that a randomly chosen American can donate blood to Maria is ______. (Give your answer to 2 decimal places.)

Answer 1

`P(O\ or\ A) = 0.85`

Explanation:

Given

See attachment

Required

`P(O\ or\ A)`

From the question, we understand that she can only get blood from O or A groups. So, the probability is represented as:

`P(O\ or\ A)`

This is calculated as:

`P(O\ or\ A) = P(O) + P(A)`

Using the American row i.e. the blood must come from an American.

We have:

`P(O) = 0.45`

`P(A) = 0.40`

So, we have:

`P(O\ or\ A) = 0.45 + 0.40`

`P(O\ or\ A) = 0.85`