# A psychologist determined that the number of sessions required to obtain the trust of a new patient is either 1, 2, or 3. Let x be a random variable indicating the number of sessions required to gain the patient’s trust. The following probability function has been proposed. f ( x ) = x 6 for x = 1, 2, or 3 a. Is this probability function valid? Explain. b. What is the probability that it takes exactly 2 sessions to gain the patient’s trust? c. What is the probability that it takes at least 2 sessions to gain the patient’s trust?

13th Edition
Anderson
Publisher: CENGAGE L
ISBN: 9781305881884

13th Edition
Anderson
Publisher: CENGAGE L
ISBN: 9781305881884

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Chapter 5.2, Problem 13E
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