Engage your students with this highly relevant lesson that grounds the concept of z-scores in real-world health and science contexts! Students won't just memorize a formula—they'll use data related to Red Blood Cell (RBC) counts and heart rates to understand what it means to be "average" or "unusual" in a population. This is a 50-minute lesson on calculating a z-score for a population, given a data value, mean, and standard deviation (assuming the measure follows a normal distribution). Ke