The historical returns on a balanced portfolio have had an average return of 13% and a standard deviation of 16%. Assume that returns on this portfolio follow a normal distribution. (You may find it useful to reference the z table.) a. What percentage of returns were greater than 45%? (Round your final answer to 2 decimal places.) Percentage of returns b. What percentage of returns were below -35%? (Round your final answer to 2 decimal places.) Percentage of returns Business interns from a small private college earn an average annual salary of $43,000. Let the salary be normally distributed with a standard deviation of $18,000. (You may find it useful to reference the z table.) a. What percentage of business interns make between $40,000 and $50,000? (Round your final answer to 2 decimal places.) Percentage of high school teachers % b. What percentage of business interns make more than $80,000? (Round your final answer to 2 decimal places.) Percentage of high school teachers %