what is the use of mean, std deviation and coveriance??
Not understanding of concepts
Hey Kushal,
These are common terms used in statistics and you just know what they mean to have a good grasp of data visualization.
The mean (or average) of a set of data values is the sum of all of the data values divided by the number of data values.
The standard deviation measures the spread of the data about the mean value. It is useful in comparing sets of data which may have the same mean but a different range.
Covariance refers to the measure of how two random variables in a data set will change together. A positive covariance means that the two variables at hand are positively related, and they move in the same direction.
This picture summarises the first two terms well:
