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【判断题】
组中值与各组的实际平均水平有一定差距,它只是各组实际平均值的近似代表值,因此,用组中值计算总平均值,只是近似值。A.
正确
B.
错误
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举一反三
【单选题】The phrase almost completes itself: midlife crisis. It's the stage in the middle of the journey when people feel youth vanishing, their prospects narrowing and death approaching. There's only one prob...
A.
It has led to a lot of debate.
B.
It is widely acknowledged.
C.
It is no longer fashionable.
D.
It misrepresents real life.