The physical plant at the main campus of a large state university receives daily requests to replace fluorescent light bulbs. The distribution of the number of daily requests is bell-shaped and has a...

The physical plant at the main campus of a large state university receives daily requests to replace fluorescent light bulbs.  The distribution of the number of daily requests is bell-shaped and has a mean of 63 and a standard deviation of 6.  Using the 68-95-99.7 rule, what is the approximate percentage of light bulb replacement requests numbering between 63 and 75?

_________ % (Round your answer to the nearest tenth of a percent)