Bio 18 Learn R Tutorial 7 For Covid-19, the population statistics are - incubation period: mean =8 days, standard deviation =3 days - illness period: mean =4 days, standard deviation =2 days Between What is the probability that an infected person's incubation period is in between 7 and 11 days? R Code 1 What is the probability that an infected person's illness period is in between 7 and 11 days?.