Can anyone suggest a way to pass a variable number of parameters to a method or function where the maximum number is not known in advance?

E.g. Foxpro pseudocode below:

function calcAverage()
local n,v,i
n=pcount()
for i=1 to n
v=v+parameter(i)
next
return v/n

avg=calcAverage(1,2,3,4,5,6,7)

I know that you can declare a maximum number of parameters. But what if I dont know in advance? Should I declare 10 parameters and do the following

function calcAverage(p1,p2,p3,p4,p5,p6,p7,p8,p9,p10)
local n,v,i,sp
n=pcount()
v=0
for i=1 to n
sp='p'+ltrim(str(i,2))
v=v+&sp
next
return v/n


Costas