Variance is a powerful statistic used in data analysis and machine learning. It is one of the four main measures of variability along with range, interquartile range (IQR) and standard deviation.

Standard deviation is a statistic measuring the dispersion of a dataset relative to its mean. It is calculated as the square root of the variance. Learn how it's used.

The basic mathematical concepts of standard deviation and variance are useful to investors. Compare variance versus standard deviation and calculate each.

Physics and Python stuff. Most of the videos here are either adapted from class lectures or solving physics problems. I really like to use numerical calculations without all the fancy programming ...