if me kood fokus good, me see 21 numbers theer
step 1=sort em
me get sorted=50,60,61,62,62,63,63,64,64,64,64,65,65,65,66,66,66,67,68,69,70
quesshun 1=top 10%..., so me take top 2 numbers=70 & 69
quesshun 2=top 50%, ie top half=top 10 or 11 numbers...64,65,65,65,66,66...70
quesshun 3=top 90%=all but bottom 2 numbers=all but 50 & 60