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When people order coffee at the counter, they will either order regular or decaffeinated. assume that...

When people order coffee at the counter, they will either order regular or decaffeinated. assume that 20% order decaffeinated and 80% order regular, and the orders are independent.

a.What is the probability that, among the next 10 customers, exactly 3 order decaffeinated?

b.What is the probability that, among the next 10 customers, the number that order decaffeinated is within one standard deviation of the mean?

c. Suppose that regular costs $4 per cup and decaffeinated costs $3 per cup. What is the expected revenue for the next 10 customers?

d.What is the probability that the second order for decaffeinated occurs at the fourth customer?

e. What is the probability that the second order for decaffeinated occurs after the fourth customer?

Math   Statistics-And-Probability   
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