题目
对于评估区间(x,x+1],假定:如果nx=200,并且观察到2个死亡者,一个死亡发生在x+0.5岁,另一个死亡发生在x+0.86岁,则qx的极大似然估计为( )。
A、
B、
C、
D、
E、
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