The physical plant at the main campus of a large state university recieves daily requests to replace florecent lightbulbs. The distribution of the number of daily requests is bell-shaped and has a mean of 60 and a standard deviation of 10. Using the Empirical Rule (as presented in the book), what is the approximate percentage of lightbulb replacement requests numbering between 40 and 60? Do not enter the percent symbol. %

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