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789. The content of manganese in four samples of ferromanganese according to the results of analyzes is (%): 1) 21.34; 21.32; 21.31; 21.35. 2) 34.45; 34.41; 34.42; 34.43. 3) 50.17; 50.14; 50.13; 50.16. 4) 65.57; 65.56; 65.59; 65.60. Calculate the standard deviation in determining the manganese content.
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