A public health official is developing a long-term mental health resource plan for a representative U.S. town with 20,000 adult residents. To allocate resources effectively, they need to estimate the number of residents who are likely to meet the full diagnostic criteria for panic disorder at some point during their lives. Based on established national data for lifetime prevalence, which of the following is the most reasonable estimate?

A public health researcher is conducting a presentation for a randomly selected audience of 200 adults from the United States. Based on established lifetime prevalence rates for a specific anxiety condition characterized by recurrent, unexpected rushes of intense fear, which of the following statements is the most accurate statistical expectation for this group?