Use the Following Information for Questions

Multiple Choice

Use the following information for questions:
The average time taken to complete an exam, X, follows a normal probability distribution with mean = 60 minutes and standard deviation 30 minutes.
-By what time should 67% of the students have finished the exam? (i.e. What is the 67^th percentile for X?)

A) 60.0 minutes
B) 73.2 minutes
C) 77.9 minutes
D) 82.5 minutes