The average earnings of year-round full-time workers 25–34 years old with a bachelor’s degree or higher were $58,500 in 2003. If the standard deviation is $11,200, what can you say about the percentage of these workers who earn (3–2)
a. Between $47,300 and $69,700?
b. More than $80,900?
c. How likely is it that someone earns more than $100,000?