In a study of the relationship between measles vaccination and Guillain-Barr syndrome (GBS), Silveira et al. (A-16)

In a study of the relationship between measles vaccination and Guillain-Barré syndrome (GBS), Silveira et al. (A-16) used a Poisson model in the examination of the occurrence of GBS during latent periods after vaccinations. They conducted their study in Argentina, Brazil, Chile, and Colombia.

They found that during the latent period, the rate of GBS was 1.28 cases per day. Using this estimate rounded to 1.3, find the probability on a given day of:

(a) No cases of GBS

(b) At least one case of GBS

(c) Fewer than five cases of GBS