I could use help with the questions above:

An investment portfolio generated the following returns over the last 5 years 2014 13.00% 1 2 2015 8.50% 3.25% 3 2016 4 2017 2.75% 5 2018 5.25% Based on the last five years, calculate the portfolio's expected return for 2018 (arithmetic mean average) 6.35% . 6.45% b. 6.55% 6.65% d Calculate the sample standard deviation for the portfolio 4.26% . b. 4.20% 4.14% C 3.81%