Question

If an average of 12 customers is served per hour, what is the probability that the next customer will arrive in 6 minutes or less?

Answer 1

sounds poison-y

Answer 2

\[P(x)=\frac{e^{-\mu~\mu^x}}{x!}\]

Answer 3

P(0)+P(1)+...+P(6)

Answer 4

foiled by a bracket ...
\[P(x)=\frac{e^{-\mu}{~\mu^x}}{x!}\]