Mark a question as not participating in the mean score based on a particular choice

Hi, I have 3 questions in my survey. Let's say the scoring logic should be:

Q1: Choice 1: 100, Choice 2, 0
Q2: Choice 1: 100, Choice 2, remove this question from the scoring system when calculating mean score, and go to Q2.1
Q2.1 (skipped if Q2 has Choice 1): Choice 1: 100, Choice 2: 0

During the preview, if I choose Choice 1 for Q1 and Choice 1 for Q2, I get a mean score of 100, which is desired. But if I choose Choice 1 for Q1, Choice 2 for Q2, and then Choice 1 for Q2.1, I get a mean score of 67. It looks like Q2's weight is considered in the calculation of the mean score. Is there a way to mark a question as not participating in the scoring system based on a particular choice? In this scenario I would like to see a mean score of 100 if the choices for the three questions are 1 2 1.

Thanks for any suggestions.