What you have is a binomial distribution with success if a car has a different type of plate, and failure if it has a New York och New Jerser plate.
With and , we get
If 85 percent of the autos arriving at the Lincoln Tunnel have either New York or New Jersey license plates, what is the probability that, of the next 20 autos, 2 or fewer (i.e., 0, 1, 2) will bear license plates from states other than New York or New Jersey?
Here is the answer I came up with...
The answer I came up with is incorrect. I used the 85% divided by 20 then multiplied the answer by 2
If possible, please help me.