Physicians wish to determine whether the emergency department at the local hospital is being overused by patients with minor health problems. A random sample of 5000 patients was selected and categorized by age and degree of severity of the problem that brought them to the emergency department. Severity was measured on a scale of 1 to 3, with 3 being most severe.

Age (years)	Severity of the problem	Total
Low	Median	High
<5	1100	300	200	1600
5-14	500	900	300	1700
>14	600	500	600	1700
Total	2200	1700	1100	5000

What is the probability that a 3-year old patient with a problem of high severity is selected for review?