Windsor stock has produced returns of 22.6 percent, 18.7 percent, 15.7 percent, 11.3 percent, 9.8 percent, 7.2 percent, 5.8 percent, 3.1 percent, 1.7 percent, 0.3%, -2.7% and -5.4 percent over the past twelve years, respectively. What range of returns would you expect to see on this stock 95 percent of the time?

Please show equations to solve and not just excel. Thank you!