When determining the concentration of potassium permanganate, three students obtained the following results (mol/l):
0.1013; 0.1012; 0.1012; 0.1014;
0.1015; 0.1012; 0.1012; 0.1013;
0.1013; 0.1015; 0.1015; 0.1013.
Calculate the standard deviation of a single determination and the confidence interval of the mean for P=0.95.

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