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A psychologist determined that the number of sessions required to obtain the trust of a new...

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 the random variable indicating the number of sessions required to gain the patient's trust.

f(x)= x/6 for x= 1,2 or 3

a) Is this probability function valid?

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?

What would the excel stats functions be if any?

Math   Statistics-And-Probability   
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