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Question: Sports and Leisure The popular sport of mountain biking involves riding bikes off-road, often over very rough terrain. Trek is a leading manufacturer of mountain bikes, specially designed for durability and performance. A random sample of Trek mountain bikes was obtained and the weight (in kg) of each is given in the following table.

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a. Assume the underlying distribution is normal. Find a 99% confidence interval for the true mean weight of Trek mountain bikes.

b. Suppose Trek claims to have the lightest mountain bikes on the market, with a mean weight of 10 kg. Using your answer in part (a), is there any evidence to suggest this claim is false? Justify your answer.

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