using the 68-95-99.7 rule, what is the approx percentage of light bulb replacement request numbering BTW 63 and 67?

The maintenance department at the main campus of a large state university receives daily requests to replace flubrecent lightbully. 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 rule, what is the approximate percentage of lightbulb replacement requests numbering between 63 and 6/? Do not enter the percent symbol. ans