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Question 498:



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You need to use the Poisson Probability Distribution here since we are given just a count of the errors. 


For this we accumulate all the values up to 5, then subtract this from 1 (since we want greater than 5).  We can use the Excel formula and accumulate all the probabilities up to 5 =POISSON(5,5,TRUE) (the TRUE means to accumulate up to 5). We get .6159 or about a 61.59% probability of having less than or equal to 5 customers. So the probability of 6,7, 8 or anything more than 5 is just 1 minus this or 1-.6159 = .384 or 38.4% probability more than 5 customers will show up

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