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A smog alerthas been calledin a certain area of Los Angles in which there are severalindustrial firms. An inspector will visit 10 randomly selected firms

A smog alerthas been calledin a certain area of Los Angles in which there are severalindustrial firms. An inspector will visit 10 randomly selected firms to check for violations of regulations. Let be the number of firms visited by the inspector that are in violation.

a)If there are 50 industrial firms in the area of which 15 are in violation, what is the probability mass functionof ?

b)If there are 500 firms in the area of which 150 are in violation, write an exact expression for and propose an approximation.

Please help a and b questions.

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