Black gold has been trading on the Toronto stock exchange for more than 20 years. Black golds year end prices and dividends and the Toronto stock exchange index level over the past 5 years are listed in table 1 a) What re black golds annual returns for past 4 years? b) What are the arithmetic mean return and the geometric mean return for black gold for the last 5 -year period? c) Using the arithmetic mean, what is the standard deviation for black golds returns? d) What are the Toronto stock exchange market return for the past 4 years