You have now been introduced to the essential statistical building blocks of financial analysis. You are now equipped to answer a series of foundational questions: What is the ‘typical’ expected return of an asset? (The mean). How risky or volatile is it? (The standard deviation). How does it move in relation to the market? (The correlation coefficient). What is the range of likely outcomes? (The normal distribution). And finally, how much of its movement can be explained by the market? (The R-squared).

These concepts are not just theoretical; they are the practical tools used every day by financial professionals in risk management, portfolio construction, and asset allocation. Mastering this foundation is the first and most important step for anyone aspiring to understand the quantitative side of finance and move on to more advanced topics in financial econometrics.