Step 1 :This problem involves combinations and probability. We need to find the number of ways to choose 3 worker's comp cases out of 7 and 5 Medicare patients out of 6. Then, we need to divide this by the total number of ways to choose 8 patients out of the total 13.
Step 2 :The number of ways to choose 3 worker's comp cases out of 7 is 35.
Step 3 :The number of ways to choose 5 Medicare patients out of 6 is 6.
Step 4 :The total number of ways to choose 8 patients out of the total 13 is 1287.
Step 5 :The probability is calculated by dividing the product of the number of ways to choose 3 worker's comp cases and the number of ways to choose 5 Medicare patients by the total number of ways to choose 8 patients. This gives us a probability of 0.16317016317016317.
Step 6 :Rounding this to five decimal places, we get \(\boxed{0.16317}\).