第一句话不全吧?看了下,意思应该如下：
某大学发现20%的学生选修了基础统计学课程.（这句话漏掉词了?）
假设18名学生本季度注册了这门课程.
没有人退出（取消注册）的概率是多少?
至少有一名学生退出的概率是多少?
退出学生数量的期望值和方差是多少?
A university has found that 20% of its students
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