A supermarket manager is keeping track of the arrival of customers at checkout counters to see how many cashiers are needed to handle the fl ow. In a sample of 500 five-minute time periods, there were 22, 74, 115, 95, 94, 80, and 20 periods in which zero, one, two, three, four, five, or six or more customers, respectively, arrived at a checkout counter. Are these data consistent at the 0.05 level of significance with a Poisson distribution with λ = 3?

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