You foresee five possible economic scenarios across a holding period during which you invest in Exxon Mobil (XOM) stock. The scenarios are Excellent, Good, Average, Fair, Poor with respective...

You foresee five possible economic scenarios across a holding period during which you invest in Exxon Mobil (XOM) stock. The scenarios are Excellent, Good, Average, Fair, Poor with respective probabilities of 5%, 15%, 25%, 45%, and 10%. The projected returns on the stock for the scenarios are, in order, 67.80%, 9.00%, 5.00%, 1.00%, and –10.40%. (a) Calculate the expected return for XOM stock. (b) Calculate the standard deviation of returns surrounding XOM stock’s expected return