Excel VBA: Root Mean Square (rms) function in VBA?

Excel VBA: Root Mean Square (rms) function in VBA?

So I'm calculating basic statistics in my worksheet and it includes code
such as:
xxx = Application.worksheetfunction.average(etc etc etc
yyy = Application.worksheetfunction.min(etc etc etc
zzz = Application.worksheetfunction.max(etc etc etc
My question: Is there an RMS equivalent function where I can simply plug
it in place of where I have 'average, min, max' functions in that code?
And if there isn't then what would be the most efficient means to code in
to find RMS solutions?
I hope I've stated the goal clearly enough. I'm curious as to whether or
not there is a predefined RMS function for VBA or whether or not I've got
to create some sort of user defined function? ~ That of which I'm fairly
new to as well so if there isn't a simple line of code to write for this,
I'll have to do more reading on UDF's.
**EDIT: more background information::
I've got around 30,000 rows, and for simplicity's sake: imagine two
columns. Column A has the year i.e. 1941 or anything else through 2008.
Column B is a numeric value. I'm just trying to put code together that
gives decade summaries of Average, Min, Max, and the RMS values.