er of errors per 1000 words made by a particular typist has a Poisson distribution with a mean of 2.5. (a) Find the probability that, in a 4000 word script, there will be at least 14 typing errors. (b) Using a suitable approximation, find the probability that there will be more than 25 errors in a 10000 word dissertation.  DO NOT USE THE EXCEL METHOD!

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The number of errors per 1000 words made by a particular typist has a Poisson distribution with a mean of 2.5.
(a) Find the probability that, in a 4000 word script, there will be at least 14 typing errors.
(b) Using a suitable approximation, find the probability that there will be more than
25 errors in a 10000 word dissertation. 

DO NOT USE THE EXCEL METHOD!

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