若正常人血铅含量近似对数正态分布,拟用300名正常人血铅值确定95%正常值范围,最好采用的公式是:

A、[img=~/QImg/2013-10-14-10-49-09/image003.jpg]±2.58s
B、[img=~/QImg/2013-10-14-10-49-09/image041.jpg]
C、[img=~/QImg/2013-10-14-10-49-09/image042.jpg]
D、[img=~/QImg/2013-10-14-10-49-09/image043.jpg]
E、[img=~/QImg/2013-10-14-10-49-09/image003.jpg]±1.96S