Arithmetic cumulative value or as we call it, short, written by sculpture (x¯) is one statistical medium that is found and used a lot.
Variance (Variance) The extension value is rotated into two parts. The variance is able to measure the distribution of data.
Standard deviation is the value obtained from collecting a large amount of data obtained from collection.

Standard deviation history
The standard deviation, invented by Francis Galton in the late 1860s, is a statistical measure of normal distribution. Used for comparing that various values In how much the data set is distributed If most of the data is very close to the average The standard deviation is small. On the other hand, if each data point is very far from the mean. The standard deviation is also going to be a lot. And when all the data are equal The standard deviation is equal to zero. That is, there is no distribution One useful feature is The standard deviation uses the same unit of data. But with the variance is not

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