Query about Question 1 from "(I'm Overwhelmed) Data Analysis Progress Quiz #12" [8768]

https://prepswift.gregmat.com/quizzes/quiz/im-overwhelmed-data-analysis-progress-quiz-12 (Question 1)


The answer is that all the probabilities of each number in the list = 1, though what if the probability for one of the numbers is 0? Would the question need to specify that it’s normally distributed? maybe I’m reading it wrong

What do you think?