since 2008 is a leap year (4|2008) thus it has 366 days or

1 year = 366 days = 366*24*60*60 seconds

we need to find the rate of crimes per second

305^10^6/(366*24*60*60) = 9.65 crimes per second

In 2008, it is an estimated that 304,095,000 lived in America so the average of crimes per person will be

305,000,000/304,095,000 = 1 crime per American.