3.20. National Geographic Traveler magazine recently presented data on the annual number of vacation days averaged by residents of eight different coun- tries. They reported 42 days for Italy, 37 for France, 35 for Germany, 34 for Brazil, 28 for Britain, 26 for Canada, 25 for Japan, and 13 for the United States.

(a) Find the mean and standard deviation. Inter- pret.

(b) Report the five-number summary. (Hint: You can find the lower quartile by finding the median of the four values below the median.)