Stochastic modelling, poisson process

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SUMMARY

The discussion centers on the application of the Poisson process to model typographical errors in a 600-page book containing 240 errors. The user calculates the error rate as 0.4 errors per page and derives the probability of three successive pages being error-free as e^(-1.2). However, the provided answer index suggests e^(-12), leading to confusion regarding the accuracy of the textbook's answer. The user questions the validity of the index's solution, noting discrepancies in numerical outcomes.

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Homework Statement


Suppose a book of 600 pages contains a total of 240 typographical errors. Develop a poisson approximation for the probability that three partiular successive pages are error-free.




The Attempt at a Solution



I say that the number of errors is poissondistributed with errorate 240/600=0.4 errors/pages.

The probability of 0 errors for 3 pages is:

(3*0.4)^0*e^(-3*0.4)/0!=e^(-1.2)

But the answer index says that the answer is e^(-12). That is, there should not be a dot there, why?
 
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Looks right to me. It could be an error in the back of the book.
 
Just as a gut check, if each page had a .4 chance of an error independently, the chance of no errors would be .63 = .216. Your answer numerically is .3 which is fairly close, while the answer in the back of the book says that the odds of these three pages having no errors in on the order of one in a million, which sounds pretty unreasonable
 

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