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better use proportion random variable 5.48 The tread life of tires from Nokian Tyres, a Finnish automobile company, can be modeled by a normal distribution

better use proportion random variable
5.48 The tread life of tires from Nokian Tyres, a Finnish automobile company, can be modeled by a normal distribution with a mean of 35,000 miles and a stan- dard deviation of 5,000 miles. A sample of 200 of these tires is taken. What is the probability that more than 40 of them have tread lives of more than 40,000 miles

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