A major U.S. automaker has determined that the city mileage for one of its new SUV models is normally distributed with a mean equal to 15.2 mpg. A report issued by the company indicated that 22 percent of the SUV model vehicles will get more than 17 mpg in the city. Given this information, what is the city mileage standard deviation for this SUV model?
how do you get .7722 from .22?
A) Approximately 2.34 mpg
B) 1.8 mpg
C) 0.77 mpg
D) Approximately 3.1 mpg