Exhibit 13.1
The following questions are based on the output below.
A store currently operates its service system with 1 operator. Arrivals follow a Poisson distribution and service times are exponentially distributed. The following spreadsheet has been developed for the system. 
-If the number of arrivals in a time period follow a Poisson distribution with mean λ then the inter-arrival times follow a(n) ____ distribution with mean ____.
Definitions:
Output
The total amount of goods or services produced by a firm, industry, or economy in a given period.
Monopolist
A monopolist is a single seller in a market who has significant control over the supply of a product or service, and thus can influence prices and market conditions.
Marginal Revenue
This is the increase in revenue that results from the sale of an additional unit of a product.
Marginal Cost
The change in total production cost that arises when the quantity produced is incremented by one unit.
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