Medical Helicopters In the same study cited in the preceding exercise, among the 47,637 patients transported by helicopter, 188 of them left the treatment center against medical advice, and the other 47,449 did not leave against medical advice. If 40 of the subjects transported by helicopter are randomly selected without replacement, what is the probability that none of them left the treatment center against medical advice?

31. MRI Reliability Refer to the accompanying figure showing surge protectors p and q used to protect an expensive magnetic resonance imaging (MRI) scanner used in a hospital. If there is a surge in the voltage, the surge protector reduces it to a safe level. Assume that each surge protector has a 0.985 probability of working correctly when a voltage surge occurs.

a. If the two surge protectors are arranged in series, what is the probability that a voltage surge will not damage the MRI? (Do not round the answer.)

b. If the two surge protectors are arranged in parallel, what is the probability that a voltage surge will not damage the MRI? (Do not round the answer.)

c. Which arrangement should be used for better protection?

32. Same Birthdays If 25 people are randomly selected, find the probability that no 2 of them have the same birthday. Ignore leap years.
33. Exclusive Or The exclusive or means either one or the other events occurs, but not both.

a. For the formal addition rule, rewrite the formula for P(A or B) assuming that the addition rule uses the exclusive or instead of the inclusive or.

b. Repeat Exercise 11 “Blood Groups and Types” using the exclusive or instead of the inclusive ‘or.
34. Complements and the Addition Rule Refer to the table of blood groups and types used for Exercises 9–20. Assume that one subject is randomly selected. Let A represent the event of getting someone with Group A blood and let B represent the event of getting someone with Group B blood. Find P1A or B2, find P1A or B2, and then compare the results. In general, does P1A or B2 = P1A or B2?

Transcribed Image Text:

-b-d- MRI D Series configuration MRI Parallel configuration