7.62 The article on polygraph testing of FBI a
agents
of a false-positive (a trustworthy person who nonetheless
fails the test) is .15. Let x be the number of
trustworthy
FBI agents tested until someone fails the test.
What is
the probability distribution
of x?
a.
b. What is the probability that the first false-positive
C.
will occur when the third person is tested?
What is the probability that fewer than four are
tested before the first false-positive occurs?
d. What is the probability that more than three agents
are tested before the first false-positive occurs
?
