Year	Amazon	Casio	NTG	BHP
2015	587	67.03	1.715	4.33
2016	823.48	101.31	1.53	6.21
2017	1450.89	204.29	7.15	6.76
2018	1718.73	168.49	4.3	6.57
2019	2008.72	206.59	5.16	4.13
2020	3206.2	253.83	17.99	3.17
2021	2991.47	125.79	6.19	4.08

Using Micks stock from above calculate his (annual) return and standard deviation if he owned a portfolio consisting of 80% in Amazon and 20% in BHPPlease show working out and formula used. Do not use excel.