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Of the students in a school, it is known...

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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XII BOARDS PREVIOUS YEAR-XII Boards-All Questions
  1. If A and B are square matrices of order 3 such that |A| = – 1, |B| = 3...

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  2. There are 4 cards numbered 1,3,5 and 7, one number on one card. Two ca...

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  3. Of the students in a school, it is known that 30% have 100% attendance...

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  4. Show that the minimum of Z occurs at more than two points : Minimi...

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  5. Find (dy)/(dx) at t=(2pi)/3 when x = 10 (t – sin t) and y = 12 (1 –...

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  6. If P(A)=0. 4 ,P(B)=p ,P(AuuB)=0. 6 and A and B are given to be indepen...

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  7. A company produces two types of goods A and B, that require gold and s...

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  8. Find int (dx)/sqrt(3-2x-x^2)

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  9. Determine the product [[-4, 4, 4], [-7, 1, 3],[5, -3, -1]][[1, -1, 1]...

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  10. |(1+x,1,1),(1,1+y,1),(1,1,1+z)|=xy+yz+zx+xyz

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  11. Consider f : R->{-4/3}->R-{4/3} given by f(x) = (4x+3)/(3x+4). Show t...

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  12. The number of irrational roots of the equation (4x)/(x^2+x+3)+(5x)/(...

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  13. Show that the total surface area of a closed cuboid with square bas...

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  14. Using integration, find the area of the triangle ABC, coordinates o...

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  15. Evaluate : int(-1)^2|x^3-x|\ dx

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  16. Show that the differential equation 2y e^(x/y)\ dx+(y-2x e^(x y) ) dy=...

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  17. Find the particular solution of the following differential equation...

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  18. Find the area of a parallelogram ABCD whose side AB and the diagonal A...

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  19. Find the coordinates of the point where the line through the points (...

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  20. 4 कार्ड 1,3,5 और 7 हैं, एक कार्ड पर एक नंबर। दो कार्ड बिना प्रतिस्थापन...

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