*****Listing 2*****


declare array to hold last N smaples.
load array with first N samples
set array_ptr to 1 
calculate initial TOTAL for array
calculate initial result ( TOTAL / N )

while sampling not finished
     take sample
     calculate TOTAL = TOTAL + sample - array(array_ptr)
     array(array_ptr) = sample
     result = TOTAL / n
     store result

     if array_ptr < n
        array_ptr = array_ptr + 1
     else
        array_ptr = 1
     end if
end while