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1. A tire company is considering a proposal to advertise the average durability of the company's tires. Records kept on a sample of 100 tires

1. A tire company is considering a proposal to advertise the average durability of the company's tires. Records kept on a sample of 100 tires yield a mean of 50 000km with a standard deviation of 5000km. Using the 95% confidence level, advise the manufacturer as to the limits of the average life of all tires.

2. In the above problem, calculate interval using an 80% confidence level

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