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	2016	2017	2018	2019	2020	TOTAL	AVERAGE YEARLY RETURNS	RETURN VARRIANCE	STANDARD DEVIATIONS
Sweets of oman	1.045	0.815	1.342	1.38	1.745	6.327	1.2654	0.1251133	0.353713585
Oman refreshments	1.153	1.57	2.98	3.05	2.85	11.603	2.3206	0.7934468	0.890756308
As Saffa foods	1.545	1.623	1.099	3.78	1.276	9.323	1.8646	1.1904663	1.091084919
Muscut gases	2.225	1.881	1.309	2.432	1.328	9.175	1.835	0.2610875	0.51096722
Oman oil	2.52	1.87	2.482	2.605	2.58	12.057	2.4114	0.0939498	0.306512316
Omantel	2.615	1.479	1.821	1.805	1.935	9.655	1.931	0.175038	0.418375429
Fincacial serives	2.45	1.205	1.509	2.4111	0.42	7.9951	1.59902	0.734271102	0.856896203
Al omaniya Fincacial serives	2.469	2.45	0.865	1.9	0.85	8.534	1.7068	0.6533387	0.808293697
Oman cements	2.089	1.832	1.245	1.224	1.028	7.418	1.4836	0.2049463	0.452709951
Shell oman	3.69	2.793	2.793	2.75	2.34	14.366	2.8732	0.2448767	0.494850179

Construct three types of portfolios of equal weights

Assuming that each stock has equal weight in the portfolio,

Calculate

Portfolio A, any combination of any three companies.

Portfolio B, any combination of any five companies.

Portfolio C, any combination of any seven companies.

Average yearly returns, return variances and standard deviations,

Comment and analyze based on the rankings which portfolio has the maximum returns and which portfolio is having the minimum standard deviation. Give the reasons (Economic reasons)