When a man observed a sobriety checkpoint conducted by a police​ department, he saw 658 drivers were screened and 9  were arrested for driving while intoxicated. Based on those​ results, we can estimate that ​, where P(W )= 0.01368 denotes the event of screening a driver and getting someone who is intoxicated. What does P(W)  ​denote, and what is its​ value?

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