(来学网)正态曲线下面积有一定的规律,μ±3σ的面积占总面积的
  • A.
    (来学网)80.70%
  • B.
    (来学网)85.70%
  • C.
    (来学网)98.70%
  • D.
    (来学网)99.70%
  • E.
    (来学网)99.90%