Random select 10% for each name and Highlight it.

[BunniLove]

I am trying to generate how many cases each person is doing that day. I have that listed next to the person's name. From there I need to highlight randomly 10% of case that person does. So, for instance, if a person did 17 cases, 10% would be 2. It would go and highlight 2 random cases that person did. Can someone help? I put some screenshots.

 

[eiloken]

Just like my example, when i select to cell that has "a" value and click run button, it will randomly highlight 10 percent of cell that has same value