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so this is my question: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 13.8 years, and standard deviation

so this is my question: A manufacturer knows that their items have a normally distributed lifespan, with a mean of 13.8 years, and standard deviation of 4.1 years.

The 2% of items with the shortest lifespan will last less than how many years?

And i honestly have no clue how to find the z score or how to solve this question and i was wondering if someone could help explain it?

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