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The physical plant at the main campus of a large state university receives daily requests to replace fluorescent lightbulbs. The distribution of the number of

The physical plant at the main campus of a large state university receives daily requests to replace fluorescent lightbulbs. The distribution of the number of daily requests is bell-shaped and has a mean of 57 and a standard deviation of 7. Using the 68-95-99.7 rule, what is the approximate percentage of lightbulb replacement requests numbering between 50 and 57?

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