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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？（）
A student achieves an 82 on the first test in a statistics course. From this, she assumes that her average at the end of the semester (after other tests) will be about 82. This is an example of （）.
品合格率指標(biāo)是（）
A cumulative frequency polygon is also called （）.
The number of class intervals in a frequency distribution is usually between （）.
Which of the following is not the goal of descriptive statistics?（）
某企業(yè)的生產(chǎn)計(jì)劃完成百分比采用如下分組，請指出哪項(xiàng)是正確的（）
要了解某地區(qū)全部大學(xué)生的就業(yè)情況，那么（）
A cumulative frequency distribution would provide（）.
A summary measure that is computed from a sample to describe a characteristic of the population is called（）