Please show calculations on Excel.

Asset 1	Asset 2
31-Dec-2006	12.56%	7.56%
31-Dec-2007	13.50%	8.56%
31-Dec-2008	14.23%	4.56%
31-Dec-2009	15.23%	2.12%
31-Dec-2010	14.23%	1.23%
31-Dec-2011	12.23%	0.26%
31-Dec-2012	10.23%	3.25%
31-Dec-2013	5.26%	4.89%
31-Dec-2014	4.25%	5.56%
31-Dec-2015	2.23%	6.45%
Average return
Return variance
Covariance
Proportion of asset 1	Portfolio standard deviation	Portfolio mean return
0%
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90%
100%