InfoPath Dev

Hi, I'm completely new to Infopath so I wish to get somebody help to assist me to solve my problem regarding MS InfoPath functions that I can use to do statistical calculation automatically.
Let say
I have the following repeating table (gp_qualification_data) as per below

Result 1            Result 2                 Result Range
X                            A                          X-A
Y                            B                          Y-B
Z                            C                          Z-C

                                                      Average: Avg(Result_Range)


Then, my problem is
1. What functions or method/idea that i can use to compute the following [Std Deviation] and [Repeatability] field of [Result_Range]?
2. How to compute the [Status] field automatically base on [Repeatability] field when the value less than 5



Thanks

There are no built-in statistical functions. InfoPath uses the XPath functions, plus a few of its own internal functions.

To get statistical calculations, you will need to either have a way to manually calculate those using the existing limited math features InfoPath provides, or use code to do the calculations.