That is always FALSE thus the result is always check. Robert you can use this free Excel function navigation Add-in to read detailed syntax and usage info about every function used in this formula. How to learn math formulas.
Each element is represented by its atomic symbol in the Periodic Table eg.
These should be read together with the learning tips. One trick you can use to understand a formula is to use the formula tip window which appears when you put the cursor into a formula. The result appears in cell E1. X denotes the mean of the n observations ie x x 1 x 2 x n n.