Consider the experiment where you toss two coins and notes outcome (H or T) of each. Which of the following mapping to a random variable X are allowable?
Select all that apply
1. Not enough information to answer the question
2. None of these
3. X(HH) = 0, X(HT) = 1, X(TT) = 2, X(TH) = sqrt(4) where sqrt() is the square root
4. X(HH) = 0, X(HT) = -1, X(TT) = -2, X(TH) = -3
5. X(HH) = 0, X(HT) = 1, X(TT) = 2, X(TH) = 3
6. X(HH) = 0, X(HT) = 0, X(TT) = 1, X(TH) = 1
7. X(HH) = 0, X(HT) = 2, X(TH) = 3