The number of cars entering a school is being observed. It is discovered the 60% of cars enter from the East and 40% enter from the West on a typical day.

On a particular day, 500 cars enter from the East and 400 cars enter from the West.

1) What are the uncertainties in the numbers recorded on the particular day?

2) Find the probability of obtaining a result that is just as far as or further from the mean than the observed results on the particular day.