Consider the percentage change in the value of the dollar with respect to other currencies over a four-week period (Table 5.5.7).
a. Find the standard deviation of these percentages.
b. Interpret this standard deviation. In particular, what does it measure about the foreign exchange markets?

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TABLE 5.5.7 Changing Value of the Dollar Country %Change Country Belgium Japan Brazil Mexico Britain Netherlands -5.1 Canada 1.9 % Change -5.3% -6.7 26.0 Singapore France South Korea-1.0 Hong Kong Taiwan Italy West Germany 5.1 lum 4.9 0.0 -0.t -4.7 -3.7