probability

#1
regarding poisson, how would you go about solving if a question reads:

A hospital has noted that they admit an average of 8 patients per hour. What is the probability that during the next hour exactly 0 patients will be admitted?

f(0)=8^0 e^-8/0!
=1*3.354626279E-4/0
=error: divide by 0


I am told the answer is supposed to be .000335? If that is so, how? because nothing can be divided by 0....
 
#3
thanks again quark. I am sooo glad I came across this site yesterday, has saved me a lot of trouble & time =) quick response and extremely helpful!

I'm taking eco this semester, so I'm sure I'll be coming on often