It's a bit hard to do the math in bash, but you'd also probably want to determine the mean and standard deviation for a population of checks (at least 10 or so)

It's a bit hard to do the math in bash, but you'd also probably want to determine the mean and standard deviation for a population of checks (at least 10 or so). You could calculate it across a lot of domains, or calculate it with a lot of checks to one server.