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Gaokao Math Practice Question

5.(5 分)某地区空气质量监测资料表明,一天的空气质量为优良的概率是 0.75 , 连续两天为优良的概率是 0.6 , 已知某天的空气质量为优良, 则随后一天的 空气质量为优良的概率是( $)$

  1. A.0.8
  2. B.0.75
  3. C.0.6
  4. D.0.45

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