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Question

The marks obtained by 10 students in a class are as follows. What is the probability that the average mark obtained by a student in the class is less than 70?(in decimals)

StudentEnglishHindiMathematicsScience1877890892906876783796859614716779575699186766878567607789089938927688909778185861086759389


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Solution

StudentEnglishHindiMathematicsScienceAverage187789089862906876787837968596166.7547167795768.556991867680.568785676074.7577890899387.589276889086.597781858682.25108675938985.75

The number of students with average marks less than 70 = 2

Total number of students = 10

The probability of a student securing average mark of less than 70
=210=0.2


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