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7. 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 and standard deviation o= 5 kg. 7. What conditions are required to find a confidence interval for the population mean lifetime? np ≥ 10, nq ≥ 10 the size of the sample is greater than 30 and the population is normally distributed a. b. C. o is known d. because of (b) and (c)