In December​ 2018, the average price of regular unleaded gasoline excluding taxes in the United States was ​$3.06 per gallon. Assume that the standard deviation price per gallon is $0.08 per gallon...

In December​ 2018, the average price of regular unleaded gasoline excluding taxes in the United States was ​$3.06 per gallon. Assume that the standard deviation price per gallon is $0.08
per gallon and use​ Chebyshev's Inequality to answer the following.

​(a) What minimum percentage of gasoline stations had prices within 4 standard deviations of the​ mean?

​(b) What minimum percentage of gasoline stations had prices within 2.5 standard deviations of the​ mean? What are the gasoline prices that are within

​(c) What is the minimum percentage of gasoline stations that had prices between ​$2.90
and $3.22​?