Given the following data, what is the probability that a patient with MI, DM, not CHF, and not AA will have a length of stay that exceeds 3 days?

Case	Myocardial Infarction	CHF	Diabetes	Alcoholism	Length of stay	Number of Patients
Type
1	MI	CHF	DM		5.56	120
2	MI			AA	4.1	110
3		CHF	DM	AA	5.54	100
4		CHF	DM		3.56	90
5	MI	CHF		AA	7.03	80
6	MI	CHF			5.02	70
7		CHF		AA	5.04	60
8	MI	CHF	DM	AA	7.62	50
9	MI				2.03	40
10		CHF			3.03	30
11	MI		DM		2.6	20
12			DM	AA	2.57	10
13			DM		0.61	20
14				AA	2.12	30
15					0.01	40
16	MI		DM	AA	4.57	50
MI = Myocardial Infarction; CHF = Congestive Heart Failure; DM=Diabetes Mellitus; AA=Alcohol abuse