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The lifetime of a certain brand of battery is known to have a standard deviation of 19.8 hours. Suppose that a random sample of 150 such batteries has a mean upper limit. lifetime of 36.5 hours. Based on this sample, find a 95% confidence interval for the true mean lifetime of all batteries of this brand. Then give its lower limit and Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult a list of formulas.) Lower limit: X Upper limit: D Save For Later Submit Assignment Terms of Use | Privacy | Accessibility