【单选题】
对连续型定量变量频率分布表的编制步骤错误的是（）。
①
计算极差
②
确定组段数与组距
③
确定各组段的上下限
④
组距=极差/组段的下限
⑤
列表划分组段后，清点各组段内的数据（频数）
【单选题】
_____the stress of examinations are over, we call all relax.
①
while
②
Even though
③
Now that
④
For
【单选题】
At midnight, he received a telephone call and was asked to meet at once.
①
mystery
②
mysterious
③
mystical
④
mythical