Problem which based on addition theorem on probability
The distribution of blood types for 100 Americans is listed in table. If one donor is selected at random, find out the probability of selecting the person with blood type A+ or A-.
Blood Type
O+
O-
A+
A-
B+
B-
AB+
AB-
Number
37
6
34
10
2
4
1
Expected delivery within 24 Hours
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