Z = the sales tax percentage for a randomly selected amazon purchase, where n = the total number of possible sales tax percentages for online purchases
Since Amazon is an online purchase, The set of possible values for the variable is a positive real number. It is a positive real number that must be within . It cannot exceed the tax percentage for online purchases that can be found in Amazon. is a set of online purchases that can be found on Amazon, therefore the set of possible values for the variable is
