2.26 Computer screening of tax returns is used to flag tax forms that need to be investigated further. The method correctly flags 85% of all erroneous returns and incorrectly flags 5% of error-free returns. The pool of tax returns submitted for computer screening contains 15% with errors. (a) A tax return is randomly screened. What is the probability that it is flagged by the computer and has an error? (b) What is the probability that a random tax form is flagged by the computer? (c) If a tax return is not flagged by the computer, what is the probability that it is correct