Jelaskan Example dari Téoréma Rao-Blackwell dalam bahasa sunda

Phone calls arrive at a switchboard according to a Poisson process at an average rate of λ per minute.  This rate is not observable, but the numbers of phone calls that arrived during n successive one-minute periods are observed.  It is desired to estimate the probability e−λ that the next one-minute period passes with no phone calls.  The answer given by Rao-Blackwell may perhaps be unexpected.

A extremely crude éstimator of the desired probability is

i.e., this estimates this probability to be 1 if no phone calls arrived in the first minute and zero otherwise.