Standard Deviation measures the volatility of securities. It is computed as the square root of variance with respect to the mean price. In simple language, it helps one identify the spread or deviation of a price from the mean by considering the historical price data. Higher standard deviation means the price has deviated considerably from the mean price, while lower deviation signifies minor variation from the mean.
Generally, blue-chip / large-cap stocks have a lower standard deviation compared to illiquid or small-cap stocks. When it comes to choosing a risky investment, market participants opt for stocks with higher standard deviation