An investment portfolio generated the following returns over the last 5 years 2015 2016 2017 2012 2019 -12% 6% 9% 16% 28% 16 Calculate the portfolio's expected return for 2020 (solve for arithmetic mean average) 15.00% 13.25% 12.08% 9.40% 17 Calculate the sample standard deviation for the portfolio 15.97% 14.66% This is the sample standard deviation - n minus 1 in denominator 13.11% This is the population standard deviation 9.36% . C 18 The previous two questions can be interpreted best as a. there is a 60% probability of the expected return being 9.40% b. there is a 68% probability that the return for 2014 will fall between -3.71 and 22.51% C there is a 68% probability that the return for 2019 will fall between 5.25 and 24.05% d there is a 32% probability that the return for 2014 will fall between 5.05 and 11.37%