One student is selected randomly from the following group of 500 students.     Freshman Sophomor Junior Senior Total Boy 50 58 72 60 240 Girl 70 42 78 70 260 Total 120 100 150 130 500   Find the probability that the student is a boy.        * Find the conditional probability that the student is a junior given that she is a girl. Find the probability that the student is both a boy and a freshman. Find the probability that the student is either a boy or a freshman.

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A: It is an important part of statistics . It is widely used .

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