Standard Deviation - traditional general approach

Standard deviation is frequently used to measure the volatility: higher standard deviation indicates greater variability, and lower standard deviation is related the less variability. "Standard deviation is a key tool for traders to quantify the uncertainty and risk in the market. It allows us to better understand the potential variability of returns and make informed decisions to manage our portfolios effectively." – John Bollinger. We can use standard deviation to place stop loss and take profit levels: a wider stop loss with the high standard deviation for example.