某企業(yè)2018年技術(shù)工占50%，2019年新招收了一批學(xué)徒工，使學(xué)徒工的比重增加了10%。假定全廠各級(jí)工資水平均無(wú)變化，則2019年職工總平均工資將（）

Descriptive statistics deals with methods of（）

品合格率指標(biāo)是（）

Which of the following is best to show the percentage of a total budget that is spent on each category of items？（）

The number of class intervals in a frequency distribution is usually between （）.

The number of phone calls arriving at a switchboard each hour has been recorded and the following frequency distribution has been developed.What is the cumulative frequency of the third class？（）

If the individual class frequency is divided by the total frequency, the result is the （）.

某企業(yè)的生產(chǎn)計(jì)劃完成百分比采用如下分組，請(qǐng)指出哪項(xiàng)是正確的（）

對(duì)全國(guó)各鐵路交通樞紐的貨運(yùn)量、貨物種類等進(jìn)行調(diào)查，以了解全國(guó)鐵路貨運(yùn)概況。這種調(diào)查屬于（）

One rule that must always be followed in constructing frequency distributions is that （）.