The number of typographical errors in a document follows a Poisson distribution with a mean of 4 errors per page. Let X represent the number of errors on 2 pages. Find $\sigma _ { x }$
A) 3.8
B) 2.8
C) 8
D) 4

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The Answer of The number of typographical errors in a document follows a Poisson distribution with a mean of 4 errors per page. Let X represent the number of errors on 2 pages. Find $\sigma _ { x }$
A) 3.8
B) 2.8
C) 8
D) 4

The Number of Typographical Errors in a Document Follows a Poisson