The American Red Cross says that about 45% of the US population has Type O blood
ID: 1781871 • Letter: T
Question
The American Red Cross says that about 45% of the US population has Type O blood, 40% has Type A, 11% has Type B, and the rest has Type AB. Use this information to answer the following two questions.
Someone volunteers to give blood. What is the probability that this donor has Type AB blood?
a. 0.04
b. 0.96
c. 0.510
d. 0.49
Among four potential donors (all independent of each other), what is the probability that at least one person has Type B?
a) 0.110
b) 0.8900
c) 0.6274 d)
0.3726 3 10.
Suppose a fair 6-sided die is tossed five times. What is the probability that we see at least one three in the five tosses?
a) 0.8300
b) 0.4019
c) 0.5981
d) 0.1667
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Explanation / Answer
Probablity of
Type O=0.45
Type A=0.40
Type B=.11
a)Probablity of type AB=1-(0.45+0.40+0.11)=0.04
b)For one person atleast of type B=1-(1-.11)^4=1-0.89^4=0.944
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