. You make an investment. Assume that annual returns are normally distributed with a mean return of .08 per year and a standard deviation of .20. What is the probability of (a) a positive annual return? (b) What is the probability of an annual return greater than .12? (c) What is the probability of a return of -.06 or less? (d) Suppose there are 250 trading days in a year and the return on any day is independent of the return on any other day. What is the probability of a positive return on any given day?