Measurements of the weights of a random sample of 400 ball bearings made by a certain machine one week, whowed a mean of 0.87 kilogram and a standard deviation of 0.018. The 99% confidence interval for the mean weight of all the ball bearings (rounded off to three decimals) is:  A. [0.869; 0.871]  B. [0.867; 0.871]  C. [0.869; 0.874]  D. [0.868; 0.872]

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