Question: I am attempting to solve this problem and need help with breaking down the steps. Suppose that a chemical plant fills containers with argon gas

I am attempting to solve this problem and need help with breaking down the steps.

Suppose that a chemical plant fills containers with argon gas and ships them to distribution centers located across Texas. The containers have 2,000 milliliters of product. Previous data shows a s of 125 milliliters. How large of a sample is required in order to be 90% confident of estimating the mean gas in the 2,000 milliliter container to within 20 milliliters?

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