Some help with this would be great, I'm a little confused on case.

Investment advisers estimated the stock market returns for four market segments: computers, financial, manufacturing, and pharmaceuticals. Annual return projections vary depending on whether the general economic conditions are improving, stable, or declining. The anticipated annual return percentages for each market segment under each economic condition are as follows: Economic Condition Market Segment Improving Stable Declining Computers 10% 2% -4% Financial 8% 5% -3% Manufacturing 6% 4% -2% Pharmaceuticals 6% 5% -1% a. Assume that an individual investor wants to select one market segment for a new investment. A forecast shows improving to declining economic conditions with the following probabilities: improving (0.2), stable (0.5), and declining (0.3). What is the preferred market segment for the investor, and what is the expected return? b. At a later date, revised forecast shows a potential for an improvement in economic conditions. New probabilities are as follows: improving (0.4), stable (0.4), and declining (0.2). What is the preferred market segment for the investor based on these new probabilities? What is the expected return? Directions: You will need to (1) create Decision Trees (2) show calculations for expected return, and (3) answer question a and b respectively. Grade will be based on the three aforementioned components. You can use Excel, Word, or even Paper to create the decision tree. Submit one word file attaching the decision trees and your response to question a and b