Answer:
Statistic, because it is a property of a sample and not the population.
Step-by-step explanation:
The difference between a parameter and an statistic is that the parameter is a property of a population distribution and an statistics is referred to a sample property.
For example, a sample mean is a statistic while a population mean is a parameter.
In t his case, the proportion is referring to the sample of 481 customers, so it is not a property of the population (altough we can use it to infere about the population), so this proportion (79%) is an statistic.
