is ill uns age range unu was giaues wal are musuy us: 2. Consider the information given in Figure 5-12, Vulnerable Knees. What is the probability that an orthopedic case selected at random involves knee prob- lems? Of those cases, estimate the probability that the case requires full knee replacement. Compute the probability that an orthopedic case selected at ran- dom involves a knee problem and requires a full knee replacement. Next, look at the probability distribution for ages of patients requiring full knee replacements. Medicare insurance coverage begins when a person reaches age 65. What is the probability that the age of a person receiving a knee replacement is 65 or older? FIGURE 5-12 Age of Adults Getting Knee Vulnerable Knees Replacements About 26% of orthopedic surgery involves knee problems. More than two-thirds of the 43.3% surgeries involve full knee replacements. 24.6% 26.7% 2.8% 2.9% Age: 18-44 45-64 65-74 75-84 85-older Source: American Academy of Orthopedic Surgeons