Suppose the distribution below represents the probability of a person to make a certain grade in Chemistry 101, where x = the letter grade of the student in the class (A=4, B=3, C=2, D=1, F=0).
2. Determine the probability that a student selected at random would make a C or higher in Chemistry 101.
X 0 1 2 3 4
P(X) 0.08 0.22 0.34 0.21 0.15