Based on Mongrel::Stats, Copyright (c) 2005 Zed A. Shaw
Calculates and returns the mean for the data passed so far.
Dump this Stats object with an optional additional message.
NOTE: This is an alias for average. We don‘t store values so we can‘t return the actual mean
Returns a common display (used by dump)
Resets the internal counters so you can start sampling again.
Adds a sampling to the calculations.
Calculates the standard deviation of the data so far.
[Validate]