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[" Of the students in a school,it is known that "30%" have "100%" attendance "],[" and "70%" students are irregular,Previous year results report that "70%" of "],[" all students who have "100%" attendance attain "A" grade.and "10%],[" irregular students attain A grade in their annual examination.At the "],[" end of the year,one student is chosen at random from the school and "],[" he was found to have an "A" grade.What is the probability that the "],[" student has "100%" -attendance? Is regularity required only in school "],[" Justify your answer."]

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Of all the students in a school, it is known that 30% have 100% attendance and 70% students are irregular. Previous year results report that 70% of all students who have 100% attendance attain A grade and 10% irregular students attain A grade in their annual examination. At the end of the year, one student is chosen at random from the school and he was found to have an A grade. What is the probability that the student has 100% attendance ? Is regularity required in school ? Justify your answer.

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