year	KFC	Casio	NTG	BHP
2016	587	67.03	1.715	4.33
2017	823.48	101.31	1.53	6.21
2018	1450.89	204.29	7.15	6.76
2019	1718.73	168.49	4.3	6.57
2020	2008.72	206.59	5.16	4.13
2021	3206.2	253.83	17.99	3.17
2022	2991.47	125.79	6.19	4.08

Using Micks stock from above calculate his expected (annual) return and standard deviation if Mick owned a portfolio consisting of 50% in KFC and 50% in Casio. Please show working out and fomula used. Do not use excel.