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Supplementary objective test questions




               12.3 Invoices produced within a firm are known to contain errors: 3% contain a very
                     serious error, 6% a serious error and 12% a minor error.

                     What is the probability that a randomly-chosen invoice will have a serious
                     error or a minor error?


                     A     0.06

                     B     0.09

                     C     0.18

                     D     0.21


               12.4  It has been established that 1 professional cyclist out of 100 uses an illegal
                     substance called 'X'. It is also known that there is a 95% chance that a cyclist
                     using an illegal substance will test positive in anti-doping tests, and that there is
                     a 3% chance that a cyclist who is 'clean' would also test positive (false positive).
                     A professional cycling team is conducting anti-doping tests before a major event
                     and selects one of its cyclists at random. The cyclist tests positive for the illegal
                     substance 'X'.

                     What is the probability that the cyclist does indeed use 'X'?

                     A     1%

                     B     5%

                     C     24%


                     D     25%































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