Question: Based on long - standing observation and consensus, the speeds on a curve are observed to average 5 7 m i h with a 6

Based on long-standing observation and consensus, the speeds on a curve are observed to average 57mih with a 6mih standard deviation. This is taken as "given." Some active controls are put in place (signing, flashing lights, etc.), and the engineer is sure that the average will fall to at least 50mih, with the standard deviation probably about the same.
Based on long - standing observation and

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