因为正常人的红细胞数近似服从正态分布,且此指标过大、过小均有病理意义,故制定红细胞数的95%参考值范围易用公式(  )。

因为正常人的红细胞数近似服从正态分布,且此指标过大、过小均有病理意义,故制定红细胞数的95%参考值范围易用公式(  )。

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