Скачать или смотреть The Mean

This video was created by my personal notes. The statistical mean is a measure of center designed to locate the balance point of a data set rather than describe a typical observed value. It can represent a ghost value that does not physically exist, such as an average number of wheels per vehicle, because it reflects a mathematical equilibrium created by all observations. Interpreting the mean as a physical see saw helps explain how both frequency and distance from the center determine its location, allowing extreme values to exert disproportionate pull. This sensitivity makes the mean vulnerable in skewed data, where a small number of outliers can shift the center away from what most observations look like. The weighted mean does not change this concept, it simply computes the same balance more efficiently from frequency tables by replacing repeated addition with multiplication while still requiring every value, including zeros, to preserve the integrity of the balance.