Bosco has an investment portfolio comprised of shares in three companies: Abacus, Baracus and Cerberus (A, B and C for short). The returns for shares A, B and C, have expected values 5%, 4% and 8% respectively. The covariance matrix for these returns is:

(b) calculate the expected return on Bosco's portfolio

(c) calculate the variance and standard deviation of the return on Bosco's portfolio

(d) John, another investor, also has an investment portfolio consisting of the same three shares. However, John tends to take more investment risk than Bosco. name one way that John's portfolio might differ from Bosco's? You do not have to give any explanation.