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举一反三
【单选题】Mrs. Brown had a small garden behind her house, and in the spring she planted some vegetables in it. She looked after them very carefully, and when summer came they looked very nice. One evening Mrs. ...
A.
Right.
B.
Wrong.
C.
Doesn’t say.
【多选题】随机变量的分布包含（ ）。
A.
随机变量可能取哪些值，或在哪个区间上取值
B.
随机变量在某一确定区间上取值的概率是多少
C.
随机变量的取值频率是多少
D.
随机变量在任一区间的取值频率是多少
E.
随机变量取这些值的概率是多少，或在任一区间上取值的概率是多少