Poisson Distribution - on a standard calculator

hello , can Poisson Distribution problems be worked out on a **standard **

**calculator** ?

here is a question ive been trying to solve

If there are **150** typographical errors randomly distributed in a

**600**-page manuscript, find the probability that any given page has exactly** 2 **errors.

the solution** (2.7183) - 0.25 * (0.25)2 / 2!**

the answer given is **0:024 **

my problem is this part **(2.7183) - 0.25 **

can it be done on a **standard calculator** ?

if so how?

i apologize for being Old Fashioned

but i like my standard calculator! (Worried)