Assume students' grades in an exam are approximately normally distributed with mean 50 and standard deviation 5. If the instructor decides to pass 70% of the students, then the minimum passing grade...

Extracted text: Assume students' grades in an exam are approximately normally distributed with mean 50 and standard deviation 5. If the instructor decides to pass 70% of the students, then the minimum passing grade should be considered as Select one: O N 52 O None a 53.2 O - 63.7 O 47.4