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A researcher sprayed a random sample of 100 butterflies with a particular method and observed their survival times. The mean and standard deviation were found

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A researcher sprayed a random sample of 100 butterflies with a particular method and observed their survival times. The mean and standard deviation were found to be 18.3 and 5.2 days, respectively. Use these information to construct a 99% confidence interval for the true mean survival time. What is the lower bound of this confidence interval? ( Answer with two decimal )

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