How to find a common statistical number is a crucial part of post-experiment data analysis. However, too many notations would pop into our mind if we start to carry out the data analysis. I searched across the whole Internet and tried to find all of the useful notations in this field. And I will also extend to other formal literatures in the future.
Mean: add up all of the numbers and divide by how many numbers there are.
Median: put the numbers in order and find the middle number.
Mode: the most common number.
Range: the difference between the biggest number and the smallest number.
