Stock A has an expected return of 13.1% per year and an expected return variance of 278.4%% per year. Stock B has an expected return of 9.8% per year and an expected return variance of 315.3% % per year. The covariance of the expected returns is -191.4%%. What is the correlation coefficient between the expected returns of stocks A and B?

Stock A has an expected return of 13.1% per year and an expected return variance of 278.4%% per year. Stock B has an expected return of 9.8% per year and an expected return variance of 315.3%% per year. The covariance of the expected returns is 191.4%%. What is the correlation coefficient between the expected returns of stocks A and B