A sample of 11 individuals shows the following monthly incomes.   Individual Income ($)       1   1,500       2   2,000       3   2,500       4   4,000       5   4,000       6   2,500       7   2,000       8   4,000       9   3,500     10   3,000     11 43,000   (a) Drop the income of individual number 11 and compute the standard deviation for the first 10 individuals

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