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A certain type of battery lasts an average of 3.0 years, with a standard deviation of 0.5 years. Assuming that battery lifetimes are normally distributed,

A certain type of battery lasts an average of 3.0 years, with a standard deviation of 0.5 years. Assuming that battery lifetimes are normally distributed, find the probability that a battery will last less than 2.3 years.

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