describe probability using discrete probability distribution.
A psychologist resolute that the number of sessions required to obtain the trust of a new patient is 1, 2 or 3. Let x be a random variable specifying the number of sessions required to gain the patient's trust. The following probability function has been proposed.
p(x) = for x=1, 2, or 3
1) Is this probability function valid? describe
2) describe the probability that it takes exactly 2 sessions to gain the patient's trust?
3) describe probability that it takes at least 2 sessions to gain the patient's trust?