The weighted mean formula forex is a formula used in trading to determine the moving average of different currency pairs. It is an important tool for traders as it allows them to adjust the average based on the weighting given to different currency pairs. This formula considers the importance of each pair by weighing them according to their relative strength. It can be used to calculate the overall trend of the market by taking into account the varying relative volatility of each currency pair. By using this formula, traders can gain insight into the overall trend and find more profitable trades.