调查某地发汞含量成偏态分布,估计此地发汞含量95%参考值范围为

A、[img=~/QImg/2013-10-14-10-49-09/image003.jpg]+1.96s
B、[img=~/QImg/2013-10-14-10-49-09/image003.jpg]±1.96s
C、P[img=~/QImg/2013-10-14-10-49-09/image004.jpg]-P[img=~/QImg/2013-10-14-10-49-09/image005.gif]
D、P[img=~/QImg/2013-10-14-10-49-09/image004.jpg]