The mean is the mathematical average of two or more numbers. Find out how investors and economists use the mean to track performance.

Update, Aug. 28, 2025: We checked all product prices and availability. We also added reviews of the Keurig K-Mini Mate and K-Brew+Chill, which we named "best single-serve coffee maker for iced coffee.

Investing in private credit involves making a loan, while private equity investors acquire stakes in nonpublic companies. Learn more about these alternative investments.