Guarantees the average lifetime for a car battery of a


Question: Guarantees. The average lifetime for a car battery of a certain brand is 170 weeks, with a standard deviation of 10 weeks. If the company guarantees the battery for 3 years, what percentage of the batteries sold would be expected to be returned before the end of the warranty period? Assume a normal distribution.

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Mathematics: Guarantees the average lifetime for a car battery of a
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