What is the formula for the questions above

d) By downloading the WEEKLY adjusted closing share prices of your selected Public Listed Company (PLC) and the market index (FBM KLCl index), calculate: (i) the mean (average) share price returns of your selected Public Listed Company (PLC) for each year and over the LATEST four years period; (12 marks) (ii) the risks, as measured by both standard deviation and a beta of your selected Public Listed Company (PLC) over the LATEST four years period; (3 marks) (iii) the correlation coefficient of your company's share price returns with the market returns over the LATEST four years period (FBM KLCI index). (2 marks)