The distribution of grades in a final exam conforms to the normal distribution with an average of 60 and a standard deviation of 10. Since the students taking the exam are 300 people, it is required...

The distribution of grades in a final exam conforms to the normal distribution with an average of 60 and a standard deviation of 10. Since the students taking the exam are 300 people, it is required to pass 250 of them.
What is the lowest grade required to pass?