If the securities markets are only weak form efficient, then the price of a stock will: be based solely on historical information. react slowly to new information concerning the future outlook of the firm. totally reflect the true value of the firm. react to new information over a couple of weeks. tend to overreact to new information concerning the future plans of the firm. Over the past five years, a stock provided annual returns of 12.6 percent, 5.8 percent, 7.9 percent, -11.2 percent and -2.4 percent. What is the variance of these returns? .0094 .0101 .0088 .0098 .0067