Poisson distribution :
P(x) = (λ^x * e^-λ) ÷ x!
Average sales per day = 2.75 = λ
Using the poisson probability calculator ; the probability that the number of cars sold on a randomly selected day is greater than 1 is 0.76027.
This shows that the number of Times s the car dealer is likely to sell more than one car a day within a specified period of time is 0.76027 * 100 = 76.02 ( about 76%)
P(x > 1) = 0.76027