A study of one-millimeter crystal marbles used in making crystal chandeliers showed that the standar

A study of one-millimeter crystal marbles used in making crystal chandeliers showed
that the standard deviation of the weight a crystal marble is 250 milligrams. A crystal
chandelier manufacturer wishes to find the 90% confidence interval for the average
weight of a one-millimeter crystal marble. How many crystal marbles does she need to
weigh to be accurate within 15 milligrams

 

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