117. Solving a chemistry problem
Seller: Derkach
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Product description
Vanadium with dichlorochromotropic acid (DCCA) was determined by the spectrophotometric method in three weighed portions of alloyed steel. The following results are obtained: 0.54, 0.48, 0.45%. Calculate the standard deviations of the confidence interval of the average value of the mass fraction of vanadium
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