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In a certain college 20 of the physics majors belong to ethnic minorities If 10 students are selected at random from physics majors what is the probability that exactly 6 belong to an ethnic minority?
Wiki User
∙ 16y ago
Previous person's answer: That may differ depending on how many students total there are but I my self believe that is 33.333333333% and so on. Answer
It looks like something is left out - there is not enough information to give an answer here, because we don't know how many students are in the physics department. For example, if there are 20 then all are in an ethnic minority, so all ten chosen at random will also be in an ethnic minority, and the chance that exactly 6 will be 'ethnic' is of course, zero. A possibility that would make the question easy to answer is that you just left out a percent symbol in the question - that is, that it should say, "20 % of the physics majors".
You need to edit the question. If for example there are 100 students in the department then you can either look up the rules for finding the probability or reason it out from basic principles.
If my guess is correct that the original problem said 20% where you say "20"
then you want to look up the "choose" function, your answer will involve
"10 choose 6" times a power of 0.2 and a power of 0.8. This should be a sufficient
hint to look up the correct answer.
Wiki User
∙ 16y ago
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