# SOLUTION: 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 chande

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 Click here to see ALL problems on Probability-and-statistics Question 462607: 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 milligramsAnswer by stanbon(57984)   (Show Source): You can put this solution on YOUR website!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 ------------------ n = [z*s/E]^2 --- n = [1.645*250/15]^2 = 752 when rounded up =============================================== Cheers, Stan H. ==========