3. Suppose 60% of the freshmen at your school take a course in compass
navigation. The probability that a freshman selected at random did not get lost
on the class hike is 90%. The probability that a freshman selected at random
took the course and did not get lost is 50%.
a. What is P(did not get lost took the course)?
P(did not get lost took the course) = P(took the course and did not get lost)
P(took the course)
0.5
b. Kei says P(took the course I did not get lost) is 1. Correct Kei's error.