That's pretty much what I meant.Yup, easier yet is the Excel spreadsheet function STDEV.
To find the standard deviation of a set of numbers click in the cell where you want the result to be. Type "=" then "stdev". Click and select your range of numbers. Then finish off the formula by typing ")", hit Enter.
I also use the functions AVERAGE for finding the average velocity of a chrono sample, LARGE for finding the fastest velocity, and SMALL for the slowest velocity. Calculate extreme spread by subtracting SMALL from LARGE.
I'll bet it's a lot like readers digest. Many do not see the need for summaries.I have never understood the interest in SD.