Final answer:
The repeat rate for the exam is approximately 33%, which indicates that 2 out of the 6 x-rays taken were repeated.
Step-by-step explanation:
The repeat rate for the exam is calculated by dividing the number of repeated x-rays by the total number of x-rays taken. Since there were 2 repeats out of a total of 6 x-rays, the repeat rate is 2/6 which simplifies to 1/3. To express this as a percentage, we multiply by 100 and get approximately 33%.