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Bobby randomly selects 142 subscribers of Stingray Karaoke on YouTube and asked how much time they typically spend on the site during the week. The

Bobby randomly selects 142 subscribers of Stingray Karaoke on YouTube and asked how much time they typically spend on the site during the week. The sample mean is 2.76 hours and the population standard deviation is 2.19. What is the upper limit of a 95% confidence interval?

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