need help

- Question 8 1 point Number Help JE? A stock had returns of 18 percent, 39 percent, and -15 percent over the past 3 years. What is the mean of the stock's returns over the past 3 years minus the sample standard deviation of the stock's returns from the past 3 years? Answer as a rate in decimal format so that 12.34% would be entered as 1234 and 0.98% would be entered as .0098. Number =0.0