Oddly, the best hope for avoiding that 90-day wait could come from your cable company. HBO says it's in discussions with some cable, satellite and telephone providers that could sell access to HBO Now at launch, but nothing is set so far.
1 Use the Excel Formula =STDEV() and select the range of values which contain the data. 2  This calculates the sample standard deviation (n-1).3  Use the web Standard Deviation calculator and paste your data, one per line. Use the Excel Formula =STDEV() and select the range of values which contain the data. 2  This calculates the sample standard deviation (n-1).
Standard Deviation. The Standard Deviation is a measure of how spread out numbers are. You might like to read this simpler page on Standard Deviation first. But here we explain the formulas. The symbol for Standard Deviation is Ï (the Greek letter sigma). This is the formula for Standard Deviation: