R×C表χ[img=~/QImg/2013-10-14-10-49-09/image002.jpg]检验理论值的计算公式为

A、[img=~/QImg/2013-10-14-10-49-09/image044.jpg]
B、[img=~/QImg/2013-10-14-10-49-09/image045.jpg]
C、[img=~/QImg/2013-10-14-10-49-09/image046.jpg]
D、[img=~/QImg/2013-10-14-10-49-09/image047.jpg]
E、以上都不是