Expected value (EV) helps players make mathematically sound decisions by assessing the profitability of actions over the long run. Positive EV choices lead to long-term gains, while negative EV decisions result in losses. It considers probabilities and potential outcomes, ensuring that players focus on making the best decision rather than short-term results. By consistently following EV-based decisions, players reduce variance’s impact and maximize winnings over time, improving overall strategy and discipline.