Statistics:

Cars arrive at a certain restaurant's drive-through at a rate of 0.2 cars per minute between the hours of 11:00 P.M. and 1:00 A.M. on Saturday evening. The restaurant begins an advertising blitz that touts its late-night service. After one week of advertising, the restaurant's officials count the number of cars, X, arriving at the restaurant's drive-through between the hours of 12:00 midnight and 12:30 A.M. for 195 of its restaurants.

Hope you've had this question before, because it's long and has 3 (a through c) questions/tables to answer.