You are given below the probability distribution of returns for two currencies, CUR1 and CUR2: Probability 50% 30% 20% Return of CRR1 8% -10% 2% Return of CRR2 -5% 1% 4% Provide the formula for the covariance between two series using probabilistic data. b) Calculate the covariance between CUR1 and CUR2 returns