Instead of having sick time, Klein Manufacturing offers "Personal Time" to their employees. An employee can have up to 5 days of personal time a year before they start using their vacation time for illnesses. Any unused personal time is treated as vacation time for the following year. Employee records over the past year are presented below.

Personal Time Taken (in days) 0 1 2 3 4 5
No. of employees 3 4 3 5 4 3

If an employee is selected at random, what is the probability that, over the past year, the employee took 3 personal days?