一组数据的众数和中位数都是唯一的。

在描述性条件中，集中趋势的统计量包括众数、中位数和平均数，离散趋势则包括（）。

已知某班同学统计学考试成绩的算术平均数为78分，众数是84分，则该班学生统计学成绩中位数近似值为

Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo，without the authorization or privity of the Shipowner or his agent，is（）.

（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

A salvor may be（）the whole or part of the payment due under Salvage Convention to the extent that the salvage operations have become necessary or more difficult because of fault or neglect on his part or if the salvor has been guilty of fraud or other dishonest conduct.

The （） is used for hauling in or letting out the wires or ropes.

Vessels must be（）valid certificate of nationality or certificated of registry or license.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

当算术平均数、众数和中位数相等时其总体内部的次数分布表现为（）

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

某班统计学考试成绩的平均分为72分,中位数是78分,则该班学生统计学考试成绩的分布形状是( )