ou destroy 121 parts by dropping them from a height of ten feet and you estimate that the average cost to repair each part is $893. The population standard deviation of the repair costs is $69. Estimate the 90% confidence interval for the true mean cost of repair. What is the lower bound on the 90% confidence interval for the true mean cost of repair? Estimate your response to the first decimal point, that is, 9.1 instead of 9.

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