Question: In a simple random sample of100electronic components produced by a certain method, the mean lifetime was125 hours. Assume that component lifetimes are normally distributed with

In a simple random sample of100electronic components produced by a certain method, the mean lifetime was125 hours. Assume that component lifetimes are normally distributed with population standard deviation=20 hours. Round the critical value to no less than three decimal places.

Construct a99%confidence interval for the mean battery life. Round the answer to the nearest whole number.A99% confidence interval for the mean battery life is (___)< < (___)

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