If a student takes Japanese, there is a 75% chance that he or she will join the anime club.
In probability theory, conditional probability is a measure of the likelihood of an event occurring if another event has already occurred. Assume that A and B are two events. Given that B has already occurred. Then the conditional probability [P(A|B)] can be calculated as
P(A|B) = P(A ∩ B)/P(B), where A ∩ B denotes the event that A and B both occur together.
Let C denotes the event "a student takes Japanese" and D denotes the event "he or she is in is the anime club". Clearly, we have to find the probability of D knowing the fact that C has already occurred.
Here, P(C) = number of students take Japanese = 0.20
P(D ∩ C) = number of students take Japanese and are in anime club = 0.15
Then, P(D|C) = P(D ∩ C)/P(C) = 0.15/0.20 = 0.75
So, the percentage is 0.75 × 100% = 75%
Therefore, If a student takes Japanese, there is a 75% chance that he or she will join the anime club.
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