i need help witb c, d, and e please

Rate of return, standard deviation, coefficient of variation Personal Finance Problem Mke ss searchng lor a stock to include in his cyrient stock nortilio He is inlerested in He. Tech inc. ne fas been he follows is to indude ony securtes weth a coeficient of vanaton of returs becow t07 a. Colculate the rase of return tor each year, 2015 though 2018 , for Hi-fech slock. b. Assume that each year's rotum is equaly probable and cakcuate the avornge iefum over this tme peniod c. Calcuale the standard dewitios of eteturns over the past 4 years. (Fint Treat this dote as a sample? d. Gissed on b and e determine the coefficied of varation ot rehens for the secunly e. Given the catculaton in d what should be Mike's decron regarSing the inclurion of H - Tech stock n his portolio