6.Suppose a subdivision on the southwest side of Denver, Colorado, contains1,500houses. The subdivision was built in 1983. A sample of100houses is selected randomly and evaluated by an appraiser. If the mean appraised value of a house in this subdivision for all houses is $225,000, with a standard deviation of $8,400, what is the probability that the sample average is greater than $226,500?

7.According to Runzheimer International, a typical business traveler spends an average of $281 per day in Chicago. This cost includes hotel, meals, car rental, and incidentals. A survey of50randomly selected business travelers who have been to Chicago on business recently is taken. For the population mean of $281 per day, what is the probability of getting a sample average of more than $272per day if the population standard deviation is $47?

8.A population proportion is0.58. Suppose a random sample of656items is sampled randomly from this population.

Appendix A Statistical Tables

a.What is the probability that the sample proportion is greater than0.61?

b.What is the probability that the sample proportion is between0.56and0.62?

c.What is the probability that the sample proportion is greater than0.57?

d.What is the probability that the sample proportion is between0.55and0.57?

e.What is the probability that the sample proportion is less than0.48?