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A simple random sample of five months of sales data provided the following information:

- Develop a point estimate of the population mean number of units sold per month.

[removed][removed] - Develop a point estimate of the population standard deviation (to 2 decimals).

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The College Board American College Testing Program reported a population mean SAT score of = 1020 (*The World Almanac 2003*). Assume that the population standard deviation is = 100.

- What is the probability that a random sample of 75 students will provide a sample mean SAT score within 10 of the population mean (to 4 decimals)?

[removed][removed] - What is the probability a random sample of 75 students will provide a sample mean SAT score within 20 of the population mean (to 4 decimals)?

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