Finance. full answer required

(a) What do you mean by risk? Distinguish between systematic risk and unsystematic risk. (b) The East and West Companies,have the following probability distribution of returns: You are required to: (i) Determine the expected return of both East company and West company; (ii) Standard deviation of both the companies; (iii) If you invest 40% of your investible fund in East company and 60% in West company, what will be your portfolio return? (iv) If the correlation co-efficient of the return of two companies is .40, what will be the portfolio risk