Answer
Less risk: Professor Alpha.
More Risk: Professor Omega.
Work Step by Step
80% is a good score. Since the students in both professor's classes have the same mean score of 80%, the best choice is to choose the instructor with a lower standard deviation. With a lower dispersion, the chances of having a score close to 80% are greater. Of course, if a student wishes to take the risk and try to get a very high score, 95% or 100%, for example, he must choose Professor Omega.
