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Fluorescent lighbulbs have lifetimes that are normally distributed with a mean of 5.7 years and a standard deviation of 1.6 years. The figure below shows

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Fluorescent lighbulbs have lifetimes that are normally distributed with a mean of 5.7 years and a standard deviation of 1.6 years. The figure below shows the distribution of lifetimes of fluorescent lightbulbs. Calculate the shaded area under the curve.

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