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.


Not a robit
Please define what you are referring to in regards to nominal value.

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