Discussion
Assertion (A): A cement producer aims for a mean strength well above the grade minimum.
Reason (R): Test results vary from batch to batch, and the minimum must be met by nearly all of them.
Answer: C
Both are true and the reason gives the statistics: if the mean sat on the limit then roughly half the batches would fail, so the target is set some way above according to the observed variability. A more consistent process can run closer to the limit safely.
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