A new catalyst is being investigated for use in the production of a plastic chemical. Ten The ean yield of the 10 batches of the chemical are produced. batches is 72.5% and the standard eviation is 5.8%. Assume that the yields are independent and approximately normally stributed. he manufacturer claims that the mean yield of the new catalyst is between 67.5% and 77.5%. t what level of confidence can this claim be made? 1

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