In a book of 500 pages, it is found that there are 250 typing errors. Assume that Poisson law holds for the number of errors per page. Then, the probability that a random sample of 2 pages will contain no error, is

In a book of 500 pages, it is found that there are 250 typing errors.

1.	In a book of 500 pages, it is found that there are 250 typing errors. Assume that Poisson law holds for the number of errors per page. Then, the probability that a random sample of 2 pages will contain no error, is
A.	\[{{e}^{-0.3}}\]
B.	\[{{e}^{-0.5}}\]
C.	\[{{e}^{-1}}\]
D.	\[{{e}^{-2}}\]
Answer» D. \[{{e}^{-2}}\]

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In a book of 500 pages, it is found that there are 250 typing errors. Assume that Poisson law holds for the number of errors per page. Then, the probability that a random sample of 2 pages will contain no error, is

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