Use the information below to answer the next three questions and provide solutions for each of them in details:

SECURITY	STANDARD DEVIATION	VARIANCE
FORD	25	625
GM	35	1225
INDEX S&P 500	30	900
	COVARIANCE
Ford with the S&P	600
GM with the S&P	612.50
Ford with GM	845

1. Use the information above to calculate the correlation between Ford and GM ?

2. Use the information above to calculate the correlation between Ford and index?

3. Use the information above to calculate the correlation between GM and index?