Knees Patients receiving artificial knees often experience

Chapter , Problem R6.1

(choose chapter or problem)

Knees Patients receiving artificial knees often experience pain after surgery. The pain is measured on a subjective scale with possible values of 1 (low) to 5 (high). Let X be the pain score for a randomly selected patient. The following table gives part of the probability distribution for X. Value: 12 345 Probability: 0.1 0.2 0.3 0.3 ?? (a) Find P(X = 5). (b) If two patients who received artificial knees are chosen at random, whats the probability that both of them report pain scores of 1 or 2? Show your work. (c) Compute the mean and standard deviation of X. Show your work. s Describe the effects of transforming a random variable by adding or subtracting a constant and multiplying or dividing by a constant. s Find the mean and standard deviation of the sum or difference of independent random variables.