Answer:
P(X=8)=11.2599 %
Explanation:
According to the Poisson Model:
P=

where:
λ is the average of cars sold
x is the number of cars sold tomorrow
P is the probability of cars sold tomorrow
In our case:
Given data:
λ=10 cars
x=8 cars
Required:
The probability that the dealer sells 8 cars tomorrow=?
Solution:

P(X=8)=11.2599 %