# Question: The American Red Cross must track their supply and demand

The American Red Cross must track their supply and demand for various blood types. They estimate that about 45% of the U.S. population has Type O blood, 40% Type A, 11 % Type B, and the rest Type AB-

a) If someone volunteers to give blood, what is the probability that this donor:

i) Has Type AB blood?

ii) Has Type A or Type B blood?

iii) Is not Type O?

b) Among four potential donors, what is the probability that:

i) All are Type O?

ii) None have Type AB blood?

iii) Not all are Type A?

iv) At least one person is Type B?

a) If someone volunteers to give blood, what is the probability that this donor:

i) Has Type AB blood?

ii) Has Type A or Type B blood?

iii) Is not Type O?

b) Among four potential donors, what is the probability that:

i) All are Type O?

ii) None have Type AB blood?

iii) Not all are Type A?

iv) At least one person is Type B?

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