学生考试成绩的名次属于
A.称名变量
B.顺序变量
C.等距变量
D.比率变量
正确答案是B
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某年级178人参加英语考试,其中两道选择题的答题情况如题22表所示。请计算这两道题的难度和区分度。(计算结果保留两位小数)