#model-assumptions

Question 1: Single choice

The number of cars arriving at a store between 2 pm and 3 pm on weekdays is well modelled by a Poisson distribution with mean 6.5. On average, 11.7 people arrive by car during that hour. Why is the number of people arriving by car unlikely to follow a Poisson distribution?

People come in carloads, so individual arrivals are not independent.1
Its mean of 11.7 is not a whole number, but a Poisson mean must be an integer.2
A Poisson count is only valid when its mean is below 10.3
The count of people exceeds the count of cars, so both cannot be Poisson.4

Timed test