11. z Score for Length of Pregnancy A woman wrote to Dear Abby and claimed that she

gave birth 308 days after a visit from her husband, who was in the Navy. Lengths of pregnancies

have a mean of 268 days and a standard deviation of 15 days. Find the z score for 308

days. Is such a length unusual? What do you conclude?

12. z Score for Blood Count White blood cell counts (in cells per microliter) have a mean

of 7.14 and a standard deviation of 2.51 (based on data from the National Center for

Percentiles. In Exercises 15-18, use the given sorted values, which are the numbers

of points scored in the Super Bowl for a recent period of 24 years. Find the

percentile corresponding to the given number of points.

15. 47 16. 65 17. 54 18. 41

In Exercises 19-26, use the same list of 24 sorted values given for Exercises 15-18.

Find the indicated percentile or quartile.

19. 20. 21. 22.

23. 24. 25. 26.

27. Boxplot for Super Bowl Points Using the same 24 sorted values given for Exercises

15-18, construct a boxplot and include the values of the 5-number summary.

28. Boxplot for Number of English Words A simple random sample of pages from

Merriam-Webster's Collegiate Dictionary, 11th edition, was obtained. Listed below are the numbers

of defined words on those pages, and they are arranged in order. Construct a boxplot and

include the values of the 5-number summary.

29. Boxplot for FICO Scores A simple random sample of FICO credit rating scores was

obtained, and the sorted scores are listed below. Construct a boxplot and include the values of

the 5-number summary.

30. Boxplot for Radiation in Baby Teeth Listed below are sorted amounts of strontium-

90 (in millibecquerels or mBq) in a simple random sample of baby teeth obtained from Pennsylvania

residents born after 1979 (based on data from "An Unexpected Rise in Strontium-90

in U.S. Deciduous Teeth in the 1990s," by Mangano, et al., Science of the Total Environment).

Construct a boxplot and include the values of the 5-number summary.

Boxplots from Larger Data Sets in Appendix B. In Exercises 31-34, use the given

data sets from Appendix B.

31. Weights of Regular Coke and Diet Coke Use the same scale to construct boxplots

for the weights of regular Coke and diet Coke from Data Set 17 in Appendix B. Use the boxplots

to compare the two data sets.

32. Boxplots for Weights of Regular Coke and Regular Pepsi Use the same scale to

construct boxplots for the weights of regular Coke and regular Pepsi from Data Set 17 in Appendix

B. Use the boxplots to compare the two data sets.