Question 1: Note the (incomplete) variance-covariance matrix S shown in the spreadsheet. If the correlation between S1 and S2 is 0.45, that between S2 and S3 is 0.02, and that between S1 and S3 is 0.5, fill in the remaining elements of the variance-covariance matrix.
	Variance-covariance matrix S
	S1	S2	S3
S1	0.00090	0.00047	0.00054
S2	0.00047	0.00123	0.00000
S3	0.00054