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Tires a and tires b have an average lifespan of 50,000 miles. Tires A was found to have a standard deviation of 12,000 miles and tires b was found to have a standard deviation of 8,000 miles. Which tires are more reliable?
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5% of females smoke cigarettes. What is the probability that the proportion of smokers in a sample of 865 females would be greater than 3%
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