Answer :

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

Let E_{1} be the event that student is regular.

and E_{2} be the event that student is irregular.

Required Probabilities is-

P(E_{1}/A) = Probability that a student is regular and attained 'A' grade.

P(A/E

_{1}) = Probability that a student attained grade 'A' and is regular.

P(A/E

_{2}) = 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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