The number of train passengers who fail to pay for their tickets in a certain region has a poison distribution with a mean of 4 per train
i) all passengers pay their ticket?
ii) More than 1 passenger fail to pay for their tickets
If there are 4800 trains per month in the region,
iii) Find the expected number of trains with at least 1 non paying passenger.
iv) Calculate the average cost to the train company during a month if the average cost of a ticket is $12.54