mean sigma
时间: 2024-09-24 19:19:44 浏览: 9
"Mean" and "sigma" are terms commonly used in statistics:
1. **Mean**: Also known as the average or arithmetic mean, it is a measure of central tendency that calculates the sum of all values in a dataset divided by the number of items. It provides a single value that represents where the middle of the data set lies. In simple words, if you add up all the numbers and divide by how many there are, you get the mean.
2. **Sigma** (σ): This Greek letter represents the standard deviation, which measures the dispersion or spread of a set of data points around the mean. A low standard deviation indicates that the data points are closely grouped together, while a high standard deviation suggests more variability. It helps to understand how much the individual values deviate from the mean.
In summary, the mean gives you an idea of what's typical, and the sigma tells you how variable or consistent the data is.