wilsonjs3340 wilsonjs3340

10-11-2022
Mathematics

contestada

fluorescent lighbulbs have lifetimes that follow a normal distribution, with an average life of 1,186 days and a standard deviation of 1,849 hours. in the production process the manufacturer draws random samples of 288 lightbulbs and determines the mean lifetime of the sample. what is the standard deviation, in hours, of this sample mean?

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