Various State and National Automobile Associations Regularly Survey Gasoline Stations $$\mu , \ { \sigma } , \bar { x } , s$$

Essay

Various state and national automobile associations regularly survey gasoline stations to
determine the current retail price of gasoline. Suppose one such national association
contacts 200 stations in the United States to determine the price of regular unleaded
gasoline at each station. In the context of this problem, define the following descriptive
measures: $$\mu , \ { \sigma } , \bar { x } , s$$