2.Find P( -1 < z < 1.14)

3.The average price of a textbookis $99 with a standard deviation of $12. What is the probability that a student will pay, on a randomly selected book, more than $94 ? (Assume the variable is normally distributed)

4.In a certain normal distribution, 5% of the values lies to the left of 42, and 5% to the right of 48. Find the population mean and standard deviation.

5.Assume that women weights are normally distributed with a mean of 165 lb and standard deviation of 25 lb.

6.If 40 women are randomly selected, find the probability that they have a mean weight less than 165 lb. Between 160 and 168 lb?

7.In a study of life expectancy of 800 people in a certain geograpfic region, the mean age at death was 69 years and standard deviation of 5.2 years. If a sample of 45 people from this region is selected, compute thestandard error (the standard deviation of the sample mean) by using the correlation factor.

8.A survey found that 23% of Americans watch the Thanksgiving parade. Find the probability that at least 100 Americans will watch the parade if a random sample of 900 is selected.

9.A sample of 45 different work departments found that the employees worked an average of 310 days a year with a population standard deviation of 24 days. What is the 90% confidence interval for the average days worked?