a) A stock price is modelled using a lognormal model with drift j = 0.1 and volatility o= 0.3. i) Please provide an expression for the stock price and state at least three characteristics of the returns according to this model. [4 marks] ii) Please explain how would you empirically test independence of returns. Please provide two equivalent tests. a) A stock price is modelled using a lognormal model with drift j = 0.1 and volatility o= 0.3. i) Please provide an expression for the stock price and state at least three characteristics of the returns according to this model. [4 marks] ii) Please explain how would you empirically test independence of returns. Please provide two equivalent tests