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In a large restaurant, 2 out of every 5 customers ask for water with their meal....

In a large restaurant, 2 out of every 5 customers ask for water with their meal.

A random sample of 10 customers is selected. Find the probability that

  1. Exactly 4 ask for water with their meal.                                                          

  1. More than 6 ask for water with their meal.                                                      
  1. The restaurant has bookings for 30 customers on Father’s Day. What is the expected number and variance of customers who ask for water with their meal on this day.
Math   Statistics-And-Probability   
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