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12.72 Self-correcting exercise. A tyre manufacturer claims that more than 90% of his tyres will last at least 80,000 km. In a random sample of

12.72 Self-correcting exercise. A tyre manufacturer claims that more than 90% of his tyres will last at least 80,000 km. In a random sample of 200 tyres, 10 wore out before reaching 80,000 km. Do the data support the manufacturer's claim with

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