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The number of customers arriving at customer service of a department store follows a Poisson distribution with a mean of λ 4 0 per time unit A time unit has 10 minutes Use X to denote the time

The number of customers arriving at customer service of a department store follows a Poisson distribution with a mean of λ =4.0 per time unit. A time unit has 10 minutes. Use X to denote the time between two customer arrivals.

The mean (or expected value) of X in minutes is

The standard deviation of X in minutes is If one customer just arrived,

the probability that the next customer will arrive within the next 2.50 minutes is closest to If one customer just arrived,

the probability that the next customer will not arrive within the next 2.00 minutes is closest to

Apr 21 2020 View more View Less

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