From polling data, we know that 41 percent of juniors and 17 percent of seniors

Question

From polling data, we know that 41 percent of juniors and 17 percent of seniors that took AMS 311
in 2011 are able to remember the material well enough to pass the actuarial exam one year later, in 2012. (Assume
that all of the students take the test.) There is a party to celebrate passing the actuarial test in 2012; all of the
AMS 311 (2011) students that passed the 2012 actuarial test attend the party (and those that did not pass do not
attend). Suppose that all of the students in AMS 311 last year were juniors or seniors, and that 72 percent of them
were juniors. (a) What percentage of the AMS 311 (2011) students at the party were juniors when they took AMS
311? (b) What percentage of the students from AMS 311 (2011) attend the party?

Explanation / Answer

AMS 311
juniors =47%
seniors=17%
Suppose that all of the students in AMS 311 last year were juniors or seniors, and that 72 percent of them
as there was 41% junior in AMS 311 (2011)
so percentage of the AMS 311 (2011) students at the party were juniors when they took AMS =.2952%
Suppose that all of the students in AMS 311 last year were senior
72 percent of them were juniors so there was 28% senior of AMS 311 (2011)

there is some cofusion in this line
"Suppose that all of the students in AMS 311 last year were juniors or seniors, and that 72 percent of them"
i try my best to understand but could not

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