Question

Two types of e-mail arrived independently and at random: external e-mail at a mean rate of One every 5 minutes and internal e-mails at a mean rate of two every 5 minutes. Calculate the probability of receiving 2 or more e-mails in any 2 minute intenrval.

Answer 1

Since in both types of e-mail, fastest rate is of recieving 2 e-mails in 5 min, therefore their is no probability of getting 2 e-mails in 2 min.