A recent census at a major university revealed that 40o/o of its students mainly used Macintosh computers (Macs). The rest mainly used PCs. At the time of the census, 67Yo of the school's students were undergraduates. The rest were graduate students. In the census,23o/o of respondents were graduate students who said that they used PCs as their main computers. Suppose we select at random from among those who were part of the census.