18.某课程考试成绩 -N(72.15), 已知96分以上占2.3 %,则 sim 84 分所占比例为-|||-(A)-|||-(已知 (1)(2)=0.977)-|||-A) (1)(1)-1 (B) https:/img.zuoyebang.cc/zyb_e0826e8e090943103b3479d628ce68d3.jpg-(1)(2)-|||-(C) oplus (2)-1 (D)0.5