Excel 2003 SP3
3000+/- data points in a row-by-row listing (A2 through A3001)

STDEV provides the 1st standard deviation.
1) Unless I'm missing something, how do I do 2nd and 3rd standard deviation
calculations?
2) Some of my data is 'fringe' data. That is, by eyeballing the data I'm
seeing some data that doesn't easily 'fit'.
a) Can I eliminate the 'fringe' data somehow via a formula?
b) Can I analyze ONLY the 'fringe' data?
c) How do I quantify the 'fringe' data for exclusion or inclusion?
3) Some insight into 2nd/3rd standard deviations would be appreciated
relative to Excel 2003.
TIA!