Question 873722
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Hi
Note: 62M (Thanks for the heads up on my typo)
18 per day average in Sheffield {{{555000((723165/365)/(62M))}}} = 18
Used POISSON: average 18 (assuming You are not to use a decimal, for ex 17.74) 
P(x = 20) = .0097  Using the whole number average.
stattrek.com a good reference