InfoPath Dev

I am using Sharepoint 2010/InfoPath 2010.  I have a SP list where I have customized the form with InfoPath.  I have a multi-selection list box with 15 manually entered choices.  I need to create a rule that will run an action when the values chosen are anything other than 2 of the choices.  Is this possible?

Sorry about the delayed reply - I got pulled into another project and just got back to this.  This is what worked based on the suggested post: Put the fields to average in their own group Created a text box with type of Decimal (double) for the field to display the average In the Default Value field put this as XPath:  ...

Thank you! I will try these suggestions.

I have several tables in an InfoPath form that contain numbers.  I have calculated value fields to determine the average of the numbers entered in each table.  The problem is that it is calculating the average based on the total number of fields in the table and most of the time some of the fields do not have ...