Spare servers are maintained in stock to support IT operations. A study determined that on average, there are four demands for this type of server per day. What is the probability that on a given day a spare server will be requested
(i) More than four times?
(ii) Not at all?
(iii) If 4 servers are stocked, what is the probability of not having enough on a given day?
(iv) How many spare servers need to be stocked so that the probability of not having enough on a given day is 5%