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Question

Blood groupNumber of studentsA9B6AB3O12Total30
The above frequency distribution table represents the blood groups of 30 students of a class. Use this table to determine the probability that a student of this class, selected at random, has blood group AB.

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Solution

Total number of students = 30
Number of students having blood group AB= 3

P( students having blood group AB)=Number of students having blood group ABTotal number of students
Hence, required probability, P=330=110

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