In the United States, the average public school teacher currently earns an annual salary near $55,202. Reported national average salaries for the last six decades are listed below. YearNational Average

Teachers’ Salary
1960$4,995
1970$8,626
1980$15,970
1990$31,367
2000$41,807
2010$55,202
Determine the average mean salary for the six decades, 1960 – 2010.

$29,933.50
$25,268.50
$31,593.40
$26,327.80