The distribution of passenger vehicle speeds traveling on a certain freeway in california is nearly normal with a mean of 73.7 miles/hour and a standard deviation of 4.77 miles/hour. (a) what percent of passenger vehicles travel slower than 80 miles/hour? (round your answer to two decimal places.) % (b) what percent of passenger vehicles travel between 60 and 80 miles/hour? (round your answer to two decimal places.) % (c) how fast do the fastest 5% of passenger vehicles travel? (round your answer to four decimal places.) mph (d) the speed limit on this stretch of the freeway is 70 miles/hour. approximate what percentage of the passenger vehicles travel above the speed limit on this stretch of the freeway. (round your answer to two decimal places.)