Arecent census at a major university revealed that 40% of its students mainly used macintosh computers (macs). the rest mainly used pcs. at the time of the census, 67% of the school's students were undergraduates. the rest were graduate students. in the census, 23% of the respondents were graduate students who said that they used pcs as their primary computers. suppose we select a student at random from among those who were part of the census and learn that the student mainly uses a pc. find the probability that this person is a graduate student. show your work.

0.25

Step-by-step explanation:

40% of the students use mac computer

67% of the students are undergraduate

23% of the students are graduates and use mainly PC

Students that use PC computers = 100 -40 = 60%

Students that are graduates = 100 - 67 = 33%

Students that are graduates that use Mac = 33 - 23= 10%

Students that are undergraduate that use PC = 67 - 30 = 37%

Using conditional probability

Pr(B|A) = Pr(A and B) / Pr(A)

Pr(Graduate | mac) = Pr(graduate and mac) / Pr(mac)

= 10%/ 40%

= 1/4

= 0.25

d? maybe

step-by-step explanation:

3/20

step-by-step explanation:

well, there are 20 outcomes, and 3 of them you want. so, 3/20