Question: Firm A ' s inventory contains 2 , 0 0 0 items, firm B ' s inventory contains 5 , 0 0 0 items, and

Firm A's inventory contains 2,000 items, firm B's inventory contains 5,000 items, and firm C's inventory contains 10,000 items. The population standard deviation for the cost of the items in each firm's inventory is
=121.
A statistical consultant recommends that each firm take a sample of 50 items from its inventory to provide statistically valid estimates of the average cost per item.

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