the answer is A,B,C,D but I don't understand why? can someone explain?

18. Consider the following graph. An agent starts at node s and in every round it follows an edge with the probability given by the weight of the edge. For example, if the agent is at node s, it stays at s with probability 1/2 and it moves to the next node with probability 1/2. Let X be the random variable denoting the number of rounds it takes to get from s to t. Which of the following statements are correct. [4 marks] A. E[X]=10 B. E[X]1000)>0 D. Pr(X=5)=1/32 E. None of the above 18. Consider the following graph. An agent starts at node s and in every round it follows an edge with the probability given by the weight of the edge. For example, if the agent is at node s, it stays at s with probability 1/2 and it moves to the next node with probability 1/2. Let X be the random variable denoting the number of rounds it takes to get from s to t. Which of the following statements are correct. [4 marks] A. E[X]=10 B. E[X]1000)>0 D. Pr(X=5)=1/32 E. None of the above