Question

The average number of trailer trucks that passed by the South Road Properties in the morning is 60 trucks. What is the probability that exactly 65 trucks will pass by in the following morning?

Answer 1

Let $X=$ the number of tracks passed: $X\sim Po(\lambda).$

Given $\lambda=$ 60.

$$P(X=65)=\dfrac{e^{-60}(60)^{65}}{65!}\approx0.04035$$