Question: From a random sample of n = 40 household ceiling fans, a 90% confidence interval for the population mean p of fan speed was 2850

From a random sample of n = 40 household ceiling fans,

From a random sample of n = 40 household ceiling fans, a 90% confidence interval for the population mean p of fan speed was 2850 to 3420 ft/min. a. What does this imply that the sample mean x fan speed was? What is E in this case

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