Baby Yoda is designing a blood-based assay to detect a pathogenic virus that will result in a mutation to Ewok offspring. If an Ewok has this virus, its offspring will more closely resemble Porgs. The assay measures midichlorians and produces a numeric value ranging from 0 to over 20,000. Describe how Baby Yoda should select an optimal midichlorian threshold at which to classify 500 Ewoks, some of whom carry the virus and some of whom do not, into test positive and test negative cohorts.