Poisson Distribution

• If λ is 20 events per second, what is the probability that there will be one or more events in a twentieth of a second?

• ΔT = 0.05 seconds; λ * ΔT = 1

• Prob ( K >= 1 ) = 1 - Prob ( K = 0 ) = 1 - e-λ*ΔT = 1 - e-1 = 1 - 0.367879 = 0.632121 = 63%