The number of errors per page made by a typist has a Poisson distribution with mean 0.2 Find the Probabilities

a) makes no errors on the first two pages

b) makes exactly one error in the first three pages

c) makes her first error on the third page

d) makes no error on exactly two of the first five pages.

a) Po(0.4)

P(X< or = 0) = 0.6703 is this correct?

b) Po(0.6)

P(X< or = 1) - P(X< or = 0)

0.8781-0.5488

=0.3292 is this correct?

how do i do part c) and d)

thanks.