a distribution center monitors when packages arrive. suppose that on average 31 packages arrive per day. which of the following must hold for the package arrivals to follow a poisson process? (select all that apply) It is not possible that two packages can arrive in the span of one minute. The number of packages arriving in a one hour period does not influence the number of packages arriving in a different one hour period. The number of packages arriving in one hour is the same as in another one hour period. The time between package arrivals is fixed. The packages arrive at a uniform rate. All packages have the same weight. Packages only arrive one at a time.