When an electrical appliance store closes every Friday, it counts the inventory of washing machines. If the inventory t is less than 2 units. Replenish to 5 units. Assume that the weekly demand t for washing machines obeys a Poisson distribution with a mean value of 3. Demands that exceed the inventory will not be met and the delivery cannot be delayed. If the inventory is 5 units after the replenishment this Friday. 2 1) Seek the expectation of the inventory after the replenishment next Friday 2) See the replenishment next Friday. Probability of 5 units in stock

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