Question

Which one(s) of these twelve brands would be considered outliers, if there are indeed any at all? How extreme does something have to be considered an outlier?

Brand,Strawberry,Vanilla
1,140,140
2,210,230
3,200,170
4,200,180
5,110,100
6,180,180
7,210,150
8,140,150
9,150,150
10,220,220
11,110,120
12,210,210

Answer 1

google will give lots of references.
wikipedia has a good article, but some of it is hard going.

wolframalpha.com also has a nice article at

http://mathworld.wolfram.com/Outlier.html

Answer 2

explain how you could show five less than a number using an expression

Answer 3

How do you mentally figure out a percentage discount