The number of oil tankers arriving at a refinery each day has a Poisson distribution with parameter $\displaystyle \lambda = 3 $. Current port facilities can service only four tankers a day so that if more than four tankers arrive in a day, the additional tankers must be sent to another port.

What is the expected number of tankers serviced daily at the current port facilities?

Is is simply $\displaystyle 3 $? The other information is extraneous?