Exhibit 1.8 USE THE INFORMATION BELOW FOR THE FOLLOWING PROBLEM The annual rates of return of Stock Z for the last four years are 0.10,0.15,0.05, and 0.20, respectively. Refer to Exhibit 1.8. Compute the standard deviation of the annual rate of return for Stock Z. a. 0.1145 b. 0.0837 c. 0.0935 d. 0.0088 e. 0.0070