The stem-and-leaf display below gives the fuel efficiencies (in miles per gallon) for a sample of 17 new cars. Use the display to answer the questions that follow. Fuel efficiency (miles per gallon) 19 2 47 3 1122233 4 2335 5136 Key: 119 means a fuel efficiency of 19 miles per gallon. (a) What is the highest fuel efficiency in the sample overall? (b) What is the highest fuel efficiency in the 20s? (c) How many cars in the sample have fuel efficiencies in the 10s? B ? 8