概率论将一温度调节器放置在贮存着某种液体的容器内,调节器整定在d℃,液体的温度X(以℃计)是一个随机变量,且X~N(d,0.5²).(1)若d=90,求X不大于89的概率(2)若要求保持液体的温度大于8
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![概率论将一温度调节器放置在贮存着某种液体的容器内,调节器整定在d℃,液体的温度X(以℃计)是一个随机变量,且X~N(d,0.5²).(1)若d=90,求X不大于89的概率(2)若要求保持液体的温度大于8](/uploads/image/z/2563256-56-6.jpg?t=%E6%A6%82%E7%8E%87%E8%AE%BA%E5%B0%86%E4%B8%80%E6%B8%A9%E5%BA%A6%E8%B0%83%E8%8A%82%E5%99%A8%E6%94%BE%E7%BD%AE%E5%9C%A8%E8%B4%AE%E5%AD%98%E7%9D%80%E6%9F%90%E7%A7%8D%E6%B6%B2%E4%BD%93%E7%9A%84%E5%AE%B9%E5%99%A8%E5%86%85%2C%E8%B0%83%E8%8A%82%E5%99%A8%E6%95%B4%E5%AE%9A%E5%9C%A8d%E2%84%83%2C%E6%B6%B2%E4%BD%93%E7%9A%84%E6%B8%A9%E5%BA%A6X%28%E4%BB%A5%E2%84%83%E8%AE%A1%EF%BC%89%E6%98%AF%E4%B8%80%E4%B8%AA%E9%9A%8F%E6%9C%BA%E5%8F%98%E9%87%8F%2C%E4%B8%94X%EF%BD%9EN%EF%BC%88d%2C0.5%26sup2%3B%29.%281%29%E8%8B%A5d%3D90%2C%E6%B1%82X%E4%B8%8D%E5%A4%A7%E4%BA%8E89%E7%9A%84%E6%A6%82%E7%8E%87%EF%BC%882%EF%BC%89%E8%8B%A5%E8%A6%81%E6%B1%82%E4%BF%9D%E6%8C%81%E6%B6%B2%E4%BD%93%E7%9A%84%E6%B8%A9%E5%BA%A6%E5%A4%A7%E4%BA%8E8)
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