The Number of Typographical Errors in a Document Follows a Poisson

Multiple Choice

The number of typographical errors in a document follows a Poisson distribution with a mean of 3 errors per page. Let $X$ represent the number of errors on 3 pages. Find $P ( 9 )$ .

A) 0.1186
B) 0.0027
C) 0.1318
D) 0.9973