3.31. According to Statistical Abstract of the United States 2006, mean salary (in dollars) of secondary school teachers in 2004 in the United States varied among states with a five-number summary of 100% Max 61,800 (Illinois) 75% Q3 48,850 50% Med 42,700 25% Q1 39,250 0% Min 33,100 (South Dakota)

(a) Find and interpret the range.

(b) Find and interpret the interquartile range.