(Answered) An automotive manufacturer removes the friction linings

Statistics

An automotive manufacturer removes the friction linings from the clutch plates of drag race cars following test runs. A sampling of 10 linings for wear show the following values (in mm): 204.5, 231.1, 157.5, 190.5, 261.6, 127.0, 216.6, 172.7, 243.8, and 291.0. Estimate the average wear and its variance. Based on this sample, how many clutch plates out of a large set will be expected to show wear of more than 203 mm?

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