Final answer:
To pass the national exam, the technician has 613.33 hours.
Step-by-step explanation:
To determine how long the technician has to pass the national exam, we need to find the remaining time after completing 960 hours in 9 months. First, we calculate the average number of hours studied per month by dividing 960 by 9, which is 106.67 hours per month. Next, we subtract this average from the total number of hours in a month (approximately 720 hours) to find the remaining time to study. Therefore, the technician has around 613.33 hours to successfully pass the national exam.