At this hospital, 2% of patients are classified as Level 1, 7% are classified as Level 2, 30% are

classified as Level 3, 10% are classified as Level 5, and the remaining percentage of patients are

classified as Level 4.

At this hospital, 99% of Level 1 patients stay overnight, 90% of Level 2 patients stay overnight, 30%

of Level 3 patients stay overnight, 10% of Level 4 patients stay overnight, and 1% of Level 5 patients

stay overnight.

Kennedy (a nurse at this hospital) randomly selects a patient who is staying in the hospital

overnight. What is the probability that this patient was initially classified as Level 1? Round to the

three decimal places.

Hint

P(Level 1 GIVEN overnight) =

1Gilboy, N. , Tanabe, T. , Travers, D. , & Rosenau, A. M. -2011. Emergency severity index (ESI): A triage tool for

mergency department care Version 4. Implementation Handbook 2012 Edition Arena