TT Number Approved Frequency D The manager of the commercial mortgage department of a large bank has collected data during the past two years concerning the number of commercial mortgages approved per week. The results from these two years (104 weeks) are shown to the right. 13 24 34 1 a. Compute the expected number of mortgages approved per week. b. Compute the standard deviation. c. What is the probability that there will be more than one commercial mortgage approved in a given week? 16 8. 7. 4 6 7 1 1 a. The expected number of mortgages approved per week is 2.115. (Round to three decimal places as needed.) b. The standard deviation is 15.053 (Round three decimal places as needed.)

z Scores LeBron James, one of the most successful basketball players of all time, has a height of 6 feet 8 inches, or 203 cm. Based on statistics from Data Set 1 “Body Data” in Appendix B, his height converts to the z score of 4.07. How many standard deviations is his height above the mean?

When you have significant results in data analysis, it is customary to report all relevant means and standard deviations.   True or false

Workers' Distractions. A recent study showed that the modern working person experiences an average of 2.1 hours per day of distractions (phone calls, e- mails, impromptu visits, etc.). A random sample of 16 workers for a large corporation found that these workers were distracted an average of 1.8 hours per day and the standard deviation was 20 minutes. Estimate the true mean population distraction time with 90% confidence, and compare your answer to the results of the study. (1.654,1.946). Mean of the study is outside or "different" from the result of our study.