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Four hundred automobiles are to be inspected for California emissions

Four hundred automobiles are to be inspected for California emissions compliance. Of these, 320 actually are compliant but 80 are not. A random sample of 6 cars is chosen.

(a) Justify the use of the binomial approximation.

(b) What is the probability that all are compliant?

(c) At least 4?

(a) Justify the use of the binomial approximation.

(b) What is the probability that all are compliant?

(c) At least 4?

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