A drug was made as two tablet batches (A and he average tablet weight of batch A is 565 mg and that of batch B is 570 mg. Weight standard deviations of the batches are equal and are estimated as 20. If a sample was taken from each batch (n=10), what is the probability that the difference between sample means is at least 8 mg 0.29 O 0.44 O 0.38 0.82 O 0.17 O 0.52 O 0.65 O0.77

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