Sorry, I have no clue as to how to make the website display the actual formula visually.
Ok, so I messed up displaying the questions in a previous thread now. Here is the question straight from my worksheet.
For the data set s={x_1,x_2,...,x_n}
Show /sigma x^2= (\sum \frac{x_i^2}{N})-\mu x^2
Where /mu x= /frac{\sum x_i}{N}
All sums between i=1