2 Consider the performance of a stock fund and a bond fund, based on the state of the economy. Required: Using the information in the table above and the weights below, calculate the mean, variance, and standard deviation of a combined portfol. 17 Required: Using the information in the table above and the weights below, calculate the mean, variance, and standard deviation of a combined portiolio. (Use cells AS to D21 from the given information to complete this question.)