Two drill presses are under consideration by a manufacturer. If the first press works one day, then the probability is .9 that it will also work the next. If this press does not work one day, then it will be back in service on the next day with probability .7. For the other drill press, these two conditional probabilities are .95 and .6 , respectively. Presuming that the two presses cost the same, which should the manufacturer purchase?