Over the last four years, the common stock of Plymouth Shippers has had an average return...

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Over the last four years, the common stock of Plymouth Shippers has had an average return of 10.4 percent. Three of those four years produced returns of 16.1 percent, 15.6 percent, and 9.4 percent, respectively. What is the standard deviation for this four-year period? (Please keep six decimals. Answer should be in the format of 0.000001.) Over the last four years, the common stock of Plymouth Shippers has had an average return of 10.4 percent. Three of those four years produced returns of 16.1 percent, 15.6 percent, and 9.4 percent, respectively. What is the standard deviation for this four-year period? (Please keep six decimals. Answer should be in the format of 0.000001.)