Bart and Lisa compete in a two-day spelling contest. On the first day, Lisa gets a higher percentage right than Bart. And on the second day, Lisa gets a higher percentage right than Bart. So why did Bart win??

Such scenarios are actually possible and pose a big conundrum for sports analysts, pharmaceutical doctors, and others. How does it work? The answer involves a careful look at probabilities and fractions. Check out our handout to find out more!