Recognizing violated number in the group

Having a group of the numbers : 30, 35, 32, 41, 28, 67
Need to mark numbers violated ±20% from nominal value.

Should I use std dev, mediance, variance?


Ambassador to the humans
You should use what is appropriate.

With the little you've told us it's impossible to say what that should be.


Less is more. Stay pure. Stay poor.
Please define what you are referring to in regards to nominal value.

And what is mediance is it a counter measure to the vean?