18. (10 pts) 5.8 Fuel efficiency of Nissan Sentra: Fueleconomy.gov, the official US government source for fuel economy information, allows users to share gas mileage information on their vehicles. The histogram below shows the distribution of gas mileage (city and highway combined) in miles per gallon (MPG) from 22 users who drive a 2008 Nissan Sentra (2WD). Note that these data are user estimates and since the source data cannot be verified, the accuracy of these estimates are not guaranteed.

Nissan Sentra (2WD) from fueleconomy.gov

Average MPG, Nissan Sentra ( model year: 2008) 7 6 4 4 2 2 2 1 [19.8, 23] (22, 24.2] (24.2, 26.4] (30.8, 33] (26.4, 28.6] (28.6, 30.8] (33, 35.2]