Q. 225.0( 3 Votes )

Of the students i

Answer :

Let A be the event given as student attained 'A' grade.

Let E1 be the event that student is regular.


and E2 be the event that student is irregular.


Required Probabilities is-

P(E1/A) = Probability that a student is regular and attained 'A' grade.
P(A/E1) = Probability that a student attained grade 'A' and is regular.
P(A/E2) = Probability that a student attained grade 'A' and is irregular.


Here,




Thus, the probability that the student has 100% attendance if he


was found to have an 'A' grade is (3/4).

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