Q. 245.0( 2 Votes )

Of the students i

Answer :

Let P(E1) be the probability of students residing in hostel.




Let P(E2) be the probability of day scholar students.




30% of hostel students get an A grade


P (E│E1 ) = 30% = 0.3


20% of day scholar students get an A grade


By Baye’s Theorem



the probability that the ‘A’ grade student chosen is a hostler is;







= 0.692


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