The number of customers arriving per hour at a certain automobile service facility is assumed to follow a Poisson distribution with mean λ = 6. (a) Compute the probability that more than 12 customers will arrive in a 3-hour period. (b) What is the mean number of arrivals during a 3-hour period? Click here to view page 1 of the table of Poisson probability sums. Click here to view page 2 of the table of Poisson probability sums. Click here to view page 3 of the table of Poisson probability sums. (a) The probability that more than 12 customers will arrive is (Round to four decimal places as needed.) (b) The mean number of arrivals is (Type an integer or a decimal. Do not round.)

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