An activity being analyzed under PERT was judged to most likely have a duration of 40 days. When considering the time it would take to complete the activity if every relevant factor went well, it was estimated to be able to be doable in 20 days and even under the worst case imaginable, the task would be take 50 days. The estimates PERT duration of that activity is:

Consider the following information on stocks a, b, c and their returns (in decimals) in each state: state prob. of state a b c boom 20% 0.27 0.22 0.16 good 45% 0.16 0.09 0.07 poor 25% 0.03 0 0.03 bust 10% -0.08 -0.04 -0.02 if your portfolio is invested 25% in a, 40% in b, and 35% in c, what is the standard deviation of the portfolio in percent? answer to two decimals, carry intermediate calcs. to at least four decimals.