The historical returns on a balanced portfolio have had an average return of 7% and a standard deviation of 18%. Assume that returns on this portfolio follow a normal distribution. [You may find it useful to reference the table.] a. What percentage of returns were greater than 43% ? (Round your answer to 2 decimal places.) Percentage of returns b. What percentage of returns were below -47% ? (Round your answer to 2 decimal places.) Percentage of returns