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50% of visitors in an exhibition will buy book A, 30% will buy book B, and...

50% of visitors in an exhibition will buy book A, 30% will buy book B, and 20% are just looking around the exhibition. Suppose that there are 10 visitors.

a) Find the probability that if 10 visitors are in the exhibition, 4 will buy book A and 2 will buy book B.

b) Find the expected number of visitors that buy book A.

c) Find the expected number of visitors that buy book A, if 3 customers are looking around.

Math   Statistics-And-Probability   
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