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Fiona discovers that the lifetime of washing machines is normally distributed with mean 8 years and standard deviation 2 years. What is the probability of

Fiona discovers that the lifetime of washing machines is normally distributed with mean 8 years and standard deviation 2 years. What is the probability of a machine lasting between 6 and 10 years? 1 25% 2 10% 3 50% 68%

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