To calculate the probability that a student will complete the exam in more than 60 minutes but less than 65 minutes, you would need to know the total number of students taking the exam and the distribution of their completion times. Without that information, it's not possible to provide a specific probability.
In a real-world scenario, you would need data on how long students typically take to complete the exam, and from there, you could calculate the probability based on the number of students who fall within the 60 to 65-minute range compared to the total number of students.
If you have access to such data, you can use it to calculate the probability using the appropriate statistical methods or software.