The following histogram shows average SO2 (sulfur dioxide) boiler emission rates from selected utility companies. The data was collected from a voluntary response sample of utility companies. Does the distribution depicted in the histogram reflect the true distribution of the population? Why or why not? 
Definitions:
Presidential Veto
The power of the President to refuse to sign a bill passed by Congress, thereby preventing it from becoming law unless overridden by a two-thirds vote in both houses.
Congress
The national legislative body of a country, particularly in the United States, it's made up of two houses: the Senate and the House of Representatives.
Two-Thirds Vote
A voting requirement used in various legislative bodies, where two-thirds of the voting members must agree on a proposal for it to pass.
Seventeenth Amendment
An amendment to the U.S. Constitution ratified in 1913 that established the direct election of U.S. Senators by popular vote, replacing their selection by state legislatures.
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