[nicholas1]

I wonder how do you add xp when kill someone.Like,I am human and I kill zombie.How do I recieve the xp.I know how to set it like score.But,I want it like each kill you recieve randomy xp.For example,1st kill I get like 40 xp 2nd I get 14 and 3rd I will get like 20 see how it recieve differently.
Please help me I really need help with this.If you help me I will be so happy.