2) Write out the probability distribution table:
Pr(X = 1) = k
Pr(X = 2) = 2k
Pr(X = 3) = 3k
Pr(X = 6) = 6k.
1 = k + 2k + 3k + .... + 6k => k =
Now that you know the probabilities you can answer the questions.
3) Start by drawing a tree diagram. Can you do this?