The STANDARD DEVIATION function can be used to quickly calculate the standard deviation of a list of numbers. This tutorial includes a step by step example.
The OR function is one of Excel's Logical Functions. Like most logical functions, the output from the OR function is either the word TRUE or FALSE. This article walks you through how to use this function in Excel
Show formulas allows you to quickly show all the formulas in your Excel Spreadsheet. Doing so does not change your spreadsheet, just the way it is displayed. Show formulas allows you to quickly and easily check your spreadsheet for errors in your formulas.
Excel's COUNT function allows you to count up the number of cells containing numbers in a selected range. This tutorial contains a step by step example of using Excel's COUNT function.