Homework 4, Problem #1

[yasmine]

On question number 4 of problem #1, it asks for the mean of Y. I understand this means nxP, I think. I understand n is 3, but what is p? I'm confused on this problem. Thank you for your help!

[Taeho Kim]

Hi yasmine,

The distribution of the discrete random variable is given.
Without assuming any binomial structure,
what is the general approach to find out the mean?
Can you think of any formula?