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 38 and a standard deviation of 4. Using the empirical rule, what is the approximate percentage of lightbulb replacement requests numbering between 38 and 42? Use 68-95-99.7 and do not enter the percent symbol. ans= 96