Weekday lunch demand for spicy black bean burritos at the kiosk, a local snack bar, is approximately poisson with a mean of 22. the kiosk charges $4.00 for each burrito, which are all made before the lunch crowd arrives. virtually all burrito customers also buy a soda that is sold for 60¢. the burritos cost the kiosk $2.00, while sodas cost the kiosk 5¢. kiosk management is very sensitive about the quality of food they serve. thus, they maintain a strict "no old burrito" policy, so any burrito left at the end of the day is disposed of. the distribution function of a poisson with mean 22 is as follows: