Suppose that X is a random variable with the following probability distribution: 0.55 x = 1; 0.2 = 7; 0.1 0.15 x = 11; x = 14; otherwise. 0, P(X = x) = X = Determine the mean of X (1x). 5.15 [The answer should be a number rounded to five decimal places, don't use symbols such as %]