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Professor sent the following data to his students: Full Grade: 25, Max. grade: 22.5, Mean: 19.9, Median: 20

Assuming the number of students is n. Is it possible to calculate the minimum grade from the given data only?

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    PS: you may know some of other students' grades. For example you heard that student x1 got 21, another student x2 got 18 and so on .. but you don't know all the students' grades of course2012-01-09
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    What does "full grade" mean?2012-01-09
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    @Dan Probably "Full Grade" is the maximum grade you can get in the exam. For instance there are 5 questions 5 points each.2012-01-09
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    @marvinthemartian, is that information relevant?2012-01-09
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    @Dan Frankly, I do not think it is. But I do not know the answer yet, so maybe.2012-01-09
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    You are right, the full grade isn't helpful in the problem because the maximum grade is 22.52012-01-09
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    @OsamaGamal in terms of n, how many students grade can we know?2012-01-09

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