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I keep confusing the steps to complete these. Please help. A manufacturer knows that their items have a normally distributed lifespan, with a mean of

I keep confusing the steps to complete these. Please help.

A manufacturer knows that their items have a normally distributed lifespan, with a mean of 14.1 years, and standard deviation of 2.8 years. If you randomly purchase one item, what is the probability it will last longer than 20 years?

Answer = (Round to four decimal places.)

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