A person tosses a coin 4 times. Let the probability of heads equals to 1/2. For each heads the person receives $1.00, for each tails the person receives $0.00. Calculate the distribution of X bar when there are 4 tosses of a coin. Draw the diagram. What is the probability that X bar is less than or equal to 1/4? What is the probability that X bar is less than or equal to 1/4 or greater than or equal to 3/4?