9. 10. 11. 12. 13. 14. 15. Suppose that the waiting times at a bank drive-thru are normally distributed with p: = 4- minutes and a = 3 minutes. Find the probability that a person chosen at random waits less than 5 minutes in line. A. 0.9082 B. 0.3707 C. 0.6179 D. 0.6293 E. none ofthese Find the 65th percentile for the population of IQ scores which have a normal distribution with u = 100 and a = 15. A. 105.85 B. 105.7 C. 94.15 D. 109.75 E. none of these Suppose that American Airlines reports an on-time arrival percentage of 70% during inclement weather. If 100 random ights are tracked continuously during a snowstorm, find the probability that at least 75 flights arrive on-time? A. 0.1635 B. 0.8621 C. 0.1379 D. 0.8365 E. none of these In a study of the effects of prenatal cocaine use on infant weights, a sample of 19 babies yielded a? = 2700 g and .s = 645 9. Use this sample data to construct a 95% condence interval for p. A. 2389.11