An investor has five stocks that she follows each day. The random variable being studied is X , the number of stock that increase in value each day. The probability function for this variable is show in Table 3.1. Note that, to be a probability function, the probabilities in the second row must sum to 1. Thus, the probability that no stocks increase in value, f(0), is .34. To find the probability that, on a given day, a majority of the stock will increase in value, we need to find P[X ≥ 3]. From the table,