In an examination, a student passes if he secures 30% or more marks. He is placed in the first, second or third division accordingly, as he secures 60% or more marks, between 45% and 60%marks and marks between 30% and 45% respectively. He gets a distinction in case he secures 80% or more marks. It is noticed from the results that 10% of the students failed in the examination, whereas 5% of them obtained distinction. Calculate the percentage of students placed in the second division. Assume that marks are distributed normally.
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