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In a large restaurant an average of 3 out of every 5 customer ask for water...

In a large restaurant an average of 3 out of every 5 customer ask for water with their meal. A random sample of 10 customers is selected.
(a) Find the probability that exactly 6 ask for water with their meal?

(b) Find the probability that less than 9 people ask for water?

(c) A second random sample of 20 customers is selected. Find the smallest value of n such that P(X < n) ≥ 0.9 where the random variable X represents the number of customers who ask for water.

Math   Statistics-And-Probability   
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