Average of normal value

Average of normal value

Hi,
I have some data like below:

  1,5,6,3,7,5,20,2,-10,50,8,2

Now I want to get the average of normal value [1,5,6,3,7,5,2,8,2] and excludes [50,-10,20]. Result of normal average equals with 4.3333

What should I do to get this average in Analytics Plus? It's regression  

Analytics Plus v5.0.30

Thanks