Find the average of each list of numbers.The Mackinac Bridge is a suspension bridge that c...

Find the average of each list of numbers.

The Mackinac Bridge is a suspension bridge that connects the lower and upper peninsulas of Michigan across the Straits of Mackinac. Its total length is 26,372 feet. The Lake Pontchartrain Bridge is a twin concrete trestle bridge in Slidell, Louisiana. Its total length is 28,547 feet. Which bridge is longer and by how much? (Sources: Mackinac Bridge Authority and Federal Highway Administration, Bridge Division)