57. In the control determination of chromium by the method of three standards in the standard
on a given sample of steel containing 15.10% Cr, on two photographic plates we obtained
the following content of Cr, %: 1) 13.50; 14.00; 14.50; 2) 17.00; 16.00; 18.20.
Find out if there is a systematic error in the determination of the chromium content?

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