The probability cannot be determined because we do not know the distribution of the population. We also do not know the number of students who are taking marketing or spanish or total number of students. Since the data is incomplete, we cannot determine the probability of students taking spanish or marketing.
I would determine this probability by putting the number of students that are taking both Spanish and Marketing at the same time, over the number of student that are taking Marketing, and simplify it if I want a fraction, but if I want a percentage I will divide it and multiply by 100.
