Inventory is withdrawn from a stock of 80 items according to a Poisson distribution at the rate

Question:

Inventory is withdrawn from a stock of 80 items according to a Poisson distribution at the rate of 5 items per day. Determine the following:

(a) The probability that 10 items are withdrawn during the first 2 days.

(b) The probability that no items are left at the end of 4 days.

(c) The average number of items withdrawn over a 4-day period.

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