Simone is interested in three ASX -listed healthcare companies, Cochlear Ltd. (COH.AX),Ramsay HealthCare Ltd.(RHC.AX) andAnsellLtd.(ANN.AX. Her stock broker collected their year-end adjusted closing prices between 2003 and 2018 and Simone asks you to conduct some preliminary analysis.

calculate the expected return and standard deviation (risk) for these three common shares (show working out)

Year	COH.AX	RHC.AX	ANN.AX
2018	173.57	57.73	22.04
2017	171.23	70.12	24.30
2016	122.55	68.30	24.71
2015	95.58	67.94	21.43
2014	77.70	57.10	22.52
2013	58.92	43.26	20.67
2012	79.10	27.28	15.33
2011	62.00	19.28	14.54
2010	80.41	17.80	12.68
2009	69.07	10.89	10.93
2008	55.40	10.40	12.53
2007	74.90	10.95	12.07
2006	57.86	11.46	11.26
2005	45.73	9.50	11.05
2004	25.25	7.12	8.93
2003	21.46	4.77	6.45