Final answer:
The most likely cause of the discrepancy between Luis's experimental outcome and the predicted outcome is that he did not perform enough trials.
Step-by-step explanation:
The most likely cause of the discrepancy between Luis's experimental outcome and the predicted outcome is A. He did not perform enough trials. In this case, Luis rolled the number cube only 60 times, which is not a large enough sample size to accurately reflect the probabilities of each outcome. To obtain more reliable results, Luis should perform a larger number of trials to get closer to the expected outcome.