Random variables and discrete probability distribution

Suppose that in order for a local high school, the school PTA decides to hold a charity lottery:

Enter the charity lottery
One grand price of $20,000
20 additional prizes of $500
Tickets only $10

After reading the fine print, you discover that 10,000 tickets will be sold. Therefore the probability of winning the grand prize is 1/10,000, while the probability of winning $500 is 20/10,000. Is this a good bet (answered this question using the expected value also find a standard deviation).

A) Set up the probability model for your expected and net winning or loss of a single play.

B) use MS excel to find the expected value and the standard deviation of your expected winnings.