# Question: The optical department at Costco serves customers on a first

The optical department at Costco serves customers on a first come first serve basis. Suppose the time between customer arrivals follows the exponential distribution. Historical data indicates that customers arrive at an average rate of 10.8 per hour.

a. What is the probability that next customer will arrive within the next 3 minutes?

b. What is the probability that next customer will arrive within the next 6 to 12 minutes?

c. What is the probability that next customer will arrive after the next 10 minutes?

d. Use Excel to verify the results from parts a, b, and c.

e. What is the standard deviation for this distribution?

a. What is the probability that next customer will arrive within the next 3 minutes?

b. What is the probability that next customer will arrive within the next 6 to 12 minutes?

c. What is the probability that next customer will arrive after the next 10 minutes?

d. Use Excel to verify the results from parts a, b, and c.

e. What is the standard deviation for this distribution?

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