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The mileage which car owners get with certain kind of radial tyre is a random variable having an exponential distribution with mean 40,000 km. Find

The mileage which car owners get with certain kind of radial tyre is a random variable having an exponential distribution with mean 40,000 km. Find the probabilities that one of these tyres will last
1. At least 20,000 km
2. At most 30,000 km.

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