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The probabilities of a student getting first class or second class or third class in an examination are (2)/(7) , (3)/(5) ,(1)/(10) respectively . The probability that the students fails is .

Let l be the lower class limit of a class-interval in a frequency distribution and m be the mid-point of the class. Then, the upper class limit of the class is m+(l+m)/2 (b) l+(m+1)/2 (c) 2m-l (d) (m-2l)