Consider the percentage change in the value of the dollar with respect to other currencies over a four-week period (Table 4.3.9).
a. Find the average percentage change in the value of the dollar, averaging over all of these countries.
b. On average during this time period, did the dollar strengthen or weaken against these currencies?
c. Find the median. Why is it so different from the average in this case?
d. Draw a box plot.

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TABLE 4.3.9 Changing Value of the Dollar Country %Change Country %Change Belgium -5.3% Japan Brazil Mexico Britain Netherlands -5.1 Canada 1.9 Singapore France South Korea 1.0 Hong Kong Taiwan -6.7 -4.9 26.0 0.0 -0.1 -4.7 -3.7 West Germany51