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-10 You measure the lifetime of a random sample of 64 tires of a certain brand. The sample mean is x = 50 months. Suppose that the lifetimes for tires of this brand follow a normal distribution, with unknown mean u and standard deviation oσ= 5 kg. 10. A 97% confidence interval for u is a. 49.80 to 50.20. b. 48.64 to 51.36. c. 48.39 to 51.61. d. 40.2 to 59.8.