A manufacturer knows that their items have a normally distributed lifespan, with a mean of 7.4 years, and standard deviation of 2 years. If 8 items are picked at random, 9% of the time their mean life will be less than how many years? Give your answer to one decimal place.

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Problem 11SC: Find the mean hourly cost when the cell phone described above is used for 240 minutes.
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A manufacturer knows that their items have a normally distributed lifespan, with a mean of 7.4 years, and standard deviation of 2 years.

If 8 items are picked at random, 9% of the time their mean life will be less than how many years?

Give your answer to one decimal place.

 
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