测定某地100名正常成年男子的血红蛋白量,要估计该地正常男子血红蛋白均数,95%可信限范围为

A、[img=~/QImg/2013-10-14-10-49-09/image035.jpg]
B、[img=~/QImg/2013-10-14-10-49-09/image036.jpg]
C、[img=~/QImg/2013-10-14-10-49-09/image037.jpg]
D、[img=~/QImg/2013-10-14-10-49-09/image038.jpg]
E、[img=~/QImg/2013-10-14-10-49-09/image039.jpg]