Concept in Definition ABC

On Theory from Probability and the Statistics, the variance is that measure of dispersion that a random variable has with respect to its hope. The variance is related to the standard deviation or standard deviation, which is denoted through the lyrics Greek called sigma and that will be the square root of the variance.

To calculate the variance it will be necessary to follow the following steps: first we must calculate the mean, that is that is, the average of the numbers, then, for each number, we must subtract the mean and raise the result to square and finally the mean of those differences squared.

The main function and utility that can be found to the variance is that it allows us to know and decide what is normal, what is large, what is small, what is extra large or what is extra small.

For example, if we take several breeds of dogs and the idea is to determine which of them is the largest and which is the smallest, without a doubt, the best way to know the answer to this question will be the app of the formula of the variance.