A clinical psychologist is given tapes of 20 subjects discussing their recent dreams ...

A clinical psychologist is given tapes of 20 subjects discussing their recent dreams. The psychologist is told that 10 are high anxiety individuals and 10 are low-anxiety individuals. The psychologist’s task is to select the 10 high-anxiety subjects.

a- Count the number of sample points for this experiment. 

b- Assuming that the psychologist is guessing, assign probabilities to each of the sample points. 

c- Find the probability that the psychologist guesses all classifications correctly.

d- Find the probability that the psychologist guesses at least 9 of the 10 high-anxiety subjects correctly.