计算平均差时,若所掌握是已分组的变量数列资料,则应采用( )
A.方程式法
B.几何平均法
C.简单算术平均法
D.加权算术平均法
正确答案是D
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Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
Fishing and mountain-climbing are his favorite ( ).(relax)
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