Question: A second-stage smog alert has been called in a certain area of Los Angeles County in which there are90industrial firms. An inspector will visit20randomly selected

A second-stage smog alert has been called in a certain area of Los Angeles County in which there are90industrial firms. An inspector will visit20randomly selected firms to check for violations of regulations.

a) ForX= the number that are in violation among the20visited out of900firms, computeE(X) andV(X) both for the exact pmf and the approximating pmf is b(x; 20, 0.4) -- (900firms in the area, of which360are in violation).

ComputeE(X) andV(X) for the exact pmf.
ComputeE(X) andV(X) for the approximating pmf.

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