# STAT_515_Lec_8.R

exp(-20)*20^10/factorial(10)
dpois(10,20) # evaluates the PMF of the Poisson distribution

1 - exp(-20)

ppois(15,20)
1 - ppois(19,20)

ppois(130,140)
dpois(140,140)
1 - ppois(149,140)


1 - exp(-5/6)


dpois(2,1/3)
1 - dpois(0,1/3)
ppois(2,4)
1 - exp(-5/3)
exp(-1)