1. In a study of 35 straight couples, in which the men already had a child from a previous relationship, the stepmothers were asked to rate their happiness as a couple on a four - point scale, with low score corresponding to happiness and high scores corresponding to unhappiness. The stepmothers rated their happiness as very happy (1), happy (2), unhappy (3) and very unhappy (4). The results are recorded in the table below. What is the expected value (mean) of a stepmother's score? Round to 2 decimal places if necessary. Happiness Score (x) 1 2 3 4 Probability P(x) 0.70 0.18 0.10 0.02