A small grocery store is considering installing an express checkout line. Let X be the number of customers in the regular checkout line. Note that these numbers include the customers being served, if any. The probability distribution of X is given in the table below. 
-Find the probability that one customer is in the regular checkout line.
Definitions:
Triple Somersault
A gymnastic or acrobatic maneuver involving three complete revolutions of the body in the air.
Guinness Book
Refers to the "Guinness World Records," a reference book published annually, listing world records both of human achievements and the extremes of the natural world.
Topic Sentence
The introductory sentence in a paragraph that summarizes the main idea or point.
Open-Heart Surgery
A type of surgical procedure performed on the muscles, valves, or arteries of the heart requiring the chest to be opened.
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