1.The number of cars sold annually by used car salespeople is normally distributed with a standard deviation of 3.7. A random sample of 81 salespeople was taken, and the each person sold 24 cars on average. Find the left end of the 99% confidence interval for the population mean. (Round the answer to two decimal places if needed).

2.Suppose that in your city 6% of the voters are registered as Democrats, 33% as Republicans, and 32% as members of other parties. Voters not aligned with any official party are termed "Independent." You are conducting a poll by calling registered voters at random. In your first 3 calls, what is the probability that you talk to no Democrats? (Round to three decimal places as needed).

An optometry shop collects the following data for customers in the shop. What is the probability that a randomly selected customer is farsighted given that he is a male. (Round the result to two decimal places if needed.)

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