A multiple-choice final exam in Introduction to Chaos Theory has 50 questions with 4 choices per question. Patricia Neubauer, a sophomore student who has done well in the class throughout the semester, needs only to get 16 of the questions correct to earn an A in the course. She chooses not to study for the final exam and plans to guess the correct answer on each question. What is the probability that Ms. Neubauer will earn an A?