5. In a certain figure skating competition, a referee bribery incident occurred. The competition committee decided to increase the number of referees from the original 9 to 14, but only 7 of the 14 referees' scores would be considered valid. If 2 of the 14 referees are corrupt, the probability that the valid scores do not include any scores from the corrupt referees is $\qquad$ (the result should be expressed as a numerical value)
5. $\frac{3}{13}$