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7. The life of a Freeze Breeze electric fan is normally distributed with a mean 4...

7. The life of a Freeze Breeze electric fan is normally distributed with a mean 4 years and standard deviation 1.2 years. The manufacturer will replace any defective fan free of charge while it is under guarantee. For how many years should a Freeze Breeze fan be guaranteed if the manufacturer does not want to replace more than 5% of them?

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