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 at least two people are in line.
Definitions:
Exchange Rate
The value of one currency for the purpose of conversion to another currency, determining how much one currency is worth in terms of another.
Pesos Per Dollar
A currency exchange rate that shows how many Mexican pesos can be exchanged for one US dollar.
U.S. Economy
The economic system of the United States, characterized by private enterprise, a variety of industries, advanced technology, and a complex system of goods and services production and distribution.
Dollar Price
The value of a commodity, asset, or service denoted in units of the U.S. dollar, reflecting its cost or market value.
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