Sir, I am stuck on this question

14. A) Find the Expected Value for the given game. (Hint: E = X1P1 + X2P2 + X3P3 +..+ XnPn) Outcome, X -15 8 5 300 900 Probability, P (X) |0.7 0.15 0.1 0.046 0.004 B) with what number outcome -15 must be changed to make this game fair? 15. Find the Expected Value (for the participants) for lottery with 4000 sold tickets by price $50 and only one winning ticket for $120000