20. 在某校举行的数学竞赛中全体参赛学生的竞赛成绩�似服从正态分布已知成绩在90分以上的学生有12名 Ⅰ试问此次参赛学生总数约为 Template




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tomski20. 在某校举行的数学竞赛中全体参赛学生的竞赛成绩�似服从正态分布已知成绩在90分以上的学生有12名 Ⅰ试问此次参赛学生总数约为 coloring