In a hospital, there are 20 kidney dialysis machines and that the chance of any one of them to be out of service during a day is 0.02. Determine the probability that exactly 3 machines will be out of service on the same day.

In a workshop, there are five machines and the probability of any one of them to be out of service on a day is (1)/(4) . If the probability that at most two machines will be out of service on the same day is ((3)/(4))^(3)k then k is equal to :

In a hospital, there are 5 dialysis machine. The chance of any one of them being defective during a day is 1/10 . Find the probability that two machines will be out of order on the same day. What is the probability that at least one machine is in working order? Is this situation alright for a small hospital?

In a hospital,there are 5 dialysis machines. The chance of any one of them being during a day is (1)/(10) .Find the probability that two machines will be out of order on the same day, What is defectivethe that atprobability least one machine in order?

In a workshop,there are five machines.The probability of any one of them to be out of service on a day is (1)/(4) .If the probability that at most two machines will be out of service on the same day is ((3)/(4))^(3)k ,then k is equal to

In a hospital,there are 4 dialysis machines. The chance of any one of them being defective during a day is.(1)/(6), Find the probability that at least two machines will be in working order out of 4 so that at least two patients may use the dialysis machine.

It is observed that,it rains on 12 days out of 30 days.Find the probability that (i)it rains exactly 3 days of week.

A machine has three parts, A, B and C, whose chances of being defective are 0.02, 0.10 and 0.05 respectively. The machine stops working if any one of the parts becomes defective. What is the probability that the machine will not stop working?