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 63 and a standard deviation of 4. Using the 68-95-99.7 (Empirical) Rule, what is the approximate percentage of lightbulb replacement requests numbering between 63 and 67? The approximate percentage of lightbulb replacement requests numbering between 63 and 67 is %. (Do not enter the percent symbol.)

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