below are data on 18 people who fell ill from an incident of food poisoning. the data give the incubation period (the time in hours between eating the infected food and the first signs of illness) for each person. 16, 16, 18, 19, 20, 20, 21, 28, 32, 34, 36, 43, 46, 46, 48, 48, 72, 89 1. estimate the five number summary for these data