means to sum the results of a formula for all values given
In other words, constants inside the summed expression can be pulled outside.
In other words we can add the terms in any order
Summation of constants
When summing constants, you can multiply the constant by the number of indices you count.
[[Mean and Variance]]
Based on course material by Paul Bendich and Daniel Egger from Data Science Maths Skills
[Mean and Variance]: Mean and Variance "Mean and Variance"