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Two thirds of students in a class are boys and rest girls. It is known that the probability of a girl getting a first grade is 0.85

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Two thirds of students in a class are boys and rest girls. It is known that the probability of a girl getting a first grade is 0.85 and that of boys is 0.70. Find the probability that a students chosen at random will get first grade marks

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= (140/300) + (85/300) = 225/300 = 3/4 = 0.75

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