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A manufacturer knows that their items have a normally distributed lifespan, with a mean of 2.2...

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Statistics

A manufacturer knows that their items have a normallydistributed lifespan, with a mean of 2.2 years, and standarddeviation of 0.7 years.

If you randomly purchase 3 items, what is the probability thattheir mean life will be longer than 1 years? (Give answer to 4decimal places.)

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