Final answer:
A mean amount of $12.84 spent on produce per visit indicates a statistic since it represents a characteristic of a chosen sample and not an entire population.
Step-by-step explanation:
The question provided relates to the interpretation of a numerical datum as it pertains to a study. Specifically, it focuses on the mean amount spent on produce per visit being $12.84. This figure represents a statistic, which is a numerical value that describes a characteristic of a sample. A statistic is distinct from a parameter, which describes a characteristic of a population. In this case, since the mean value comes from the customers in the sample and not the entire population of customers, it is considered a statistic.