7. (4 marks) I have a loaded (unfair) 6-sided die. Using this die, the probability of rolling a 2 is twice as high as that of rolling a l, the probability of rolling a 3 is three times as high as that of rolling a 1, the probability of rolling a 4 is four times as high as that of rolling a 1, etc. I roll the die once. I dene a random variable, Y, as the outcome of my roll. a. (3 marks) What is the probability mass function of Y? b. (1 mark) What is the probability of rolling an even number