The Canada Urban Transit Association has reported that the average revenue per passenger trip during a given year was $1.05. If we assume a normal distribution and a standard deviation of , what proportion of passenger trips produced a revenue of
a. less than $1.05?
b. between $0.65 and $1.45?
c. between $0.85 and $1.25?
d. between $0.45 and $1.05?