David is playing a game where he flips two coins and counts the total number of heads. The possible outcomes and probabilities are shown in the probability distribution below. probability distribution of the number of heads obtained when flipping two coins. The x-axis is labeled "Number of Heads" and shows three possible outcomes: 0, 1, and 2 heads. The y-axis, labeled "Probability" ranges from 0 to slightly above 0.5. Each bar corresponds to a value of the number of heads and its associated probability. The bar for 0 heads has a height of 0.25; 1 head has a height of 0.5; and 2 heads has a height of 0.25. What is the expected value for the number of heads from flipping two coins? 2 3 1.5 1