1.. The lifetime of a certain type of electric car follows a normal distribution with the average life of 12.01 years and the standard deviation
1.. The lifetime of a certain type of electric car follows a normal distribution with the average life of 12.01 years and the standard deviation of 3.23 years. The manufacturer replaces ee all cars that fail while under guarantee. If she is willing to replace only 1.5% of the cars that fail, how long a guarantee should be offered
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