Consider the following returns for two investments, A and B. over the past four years: Investment 1: Investment 2: 5 38 138 108 -28 -88 78 138 a-1. Calculate the mean for each investment. (Round your answers to 2 decimal places.) Mean Investment 1 % % Investment 2 a-2. Which investment provides the higher return? O Investment 2 O Investment 1 b-1. Calculate the standard deviation for each investment. (Round your answers to 2 decir Standard Deviation Investment 1 Investment 2 % % b-2. Which investment provides less risk? O Investment 1 O Investment 2 C-1. Given a risk-free rate of 1.2%, calculate the Sharpe ratio for each investment. (Round you Sharpe Ratio Investment 1 Investment 2 c-1. Given a risk-free rate of 1.2%, calculate the Sharpe ratio for each investment. (Rou Sharpe Ratio Investment 1 Investment 2 c-2. Which investment has performed better? Investment 2 O Investment 1