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Calculator battery life is normally distributed with an average lifespan of 227 hours and a standard deviation of 18. What RANGE of battery life do

Calculator battery life is normally distributed with an average lifespan of 227 hours and a standard deviation of 18. What RANGE of battery life do about 92% of the calculators fall within (CENTERED AT THE MEAN)? You MUST include a labeled diagram. Hint: Choose the z-scores closest to the values you are looking for

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