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The number of customers entering a shop follows a Poisson distribution. On average there are 6 customers entering the shop every minute. a) Find the probability that at most 4 customers arrive during a minute. b) Find the probability that at least 10 customers arrive during a minute. 0) A customer has just arrived. Find the probability that the next customer arrives within 10 seconds. d) A customer has just arrived. Find the probability that you have to wait at least 30 seconds for the next customer's arrival