This is in Statistics all about Random Variable. This is only multiple choice. Provide necessary solution for each items. Thank you and Godbless.

1. Supposed we tossed a coin three times, and the random variable X" is the number of heads, what are the values of X? A) 0, 1,2.3.4 C) 0, 1, 2,3 B) 1, 2,3 D) 1, 2, 3,4 2. Supposed we tossed a coin three times, and the random variable X" is the number of heads minus the number of tails, what are the values of X? A) -3,-1,1,3 C) 0, 1,2,3 B) -3,-2,- 1,0,1,2, 3 D) -3,-1,0,1,3 3. Supposed we tossed a coin three times, and the discrete random variable X is the number of heads, find P(X's 2). Hint: First, construct the probability distribution (P.D), then find P(X's 2). A) 0.625 C) 0.875 B) 0.125 D) 0.5 4. What is the sum of all corresponding probabilities of the probability distribution? A) 0.5 C) infinity B) 1 D) 2