Question

You played sports throughout high school and college, and your knees have taken a hit. Here is a little information about knee surgeries: An article in Knee Surgery, Sports Traumatology, Arthroscopy [“Effect of Provider Volume on Resource Utilization for Surgical Procedures” (2005, Vol. 13, pp. 273–279)] are normally distributed and showed a mean time of 129 minutes and a standard deviation of 14 minutes for anterior cruciate ligament (ACL) reconstruction surgery at high-volume hospitals (with more than 300 such surgeries per year).

a. What is the probability that a randomly selected ACL surgery at a high-volume hospital lasts? longer than 143 minutes?

b. What is the probability that your ACL surgery at a high-volume hospital is completed in less than

    110 minutes?

c. What surgery time (in minutes) is exceeded only 5% of the time?

Answer 1