[valenciarose]

This isn’t an attempt to estimate a typical bill for an asymptomatic individual. It’s an attempt to set an expected value for the costs that will eventually be incurred across the population of asymptomatic patients. They are using a mean to describe how costs will scale with the size of that population (asymptomatic SARS-CoV-2 positive) and NOT as a way to describe the typical costs of individuals in that population. The cost distribution is almost certainly a power law. I’d guess the median is zero and the mean is many thousand dollars.