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:
Custody
The protective care or guardianship of someone or something, often used to describe the legal guardianship of a child or the holding of an individual by law enforcement.
Vancomycin
An antibiotic used to treat serious bacterial infections, especially those resistant to other antibiotics.
Amputation Stump
The remaining portion of a limb or appendage after a surgical amputation has been performed.
Left Elbow
The joint connecting the forearm and the upper arm on the left side of the body, enabling bending and rotating movements of the forearm.
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