The gross weekly sales at a certain used-car lot are normal, Ask an Expert

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The gross weekly sales at a certain used-car lot are normal with mean $18,800 and standard deviation $9000.

(a) What is the probability that next week's sales exceed $20,000?

(b) What is the probability that weekly sales will exceed $20,000 in each of the next 2 weeks?

In parts (b) and (c) assume that the sales totals in different weeks are independent.

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