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An interval estimate for the average distance car tyres lasted during their "lifetime" was reported to...

An interval estimate for the average distance car tyres lasted during their "lifetime" was reported to be 32468 km to 37224 km. This interval estimate was based on a sample of 48 tyres. The variance of the lifetime was determined from previous studies to be 44582179 km squared. What level of confidence can be attributed to this interval estimate? State your answer as a percentage, correct to the nearest whole number.

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