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 50 and a standard deviation of 6. Using the empirical rule (as presented in the book), what is the approximate percentage of lightbulb replacement requests numbering between 38 and 50? (Round percent number to 2 decimal places.) Do not enter the percent symbol. ans = %