A person performs a task 3 times in succession. He learns rapidly, so that his chance of error is 1/2 the first time, 114 the second time, and 1/6 the third time. We assume that he learns equally well from his successes and failures, so that the three trials may be considered independent.
(a) Find the probability table and mean of X = the total number of errors.
(b) What is the probability of more than I error?