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kevin_kai · 2021年08月04日

什么时候需要考虑下限

  1. CFA I
  2. Quantitative

NO.PZ2017092702000041

问题如下：

An analyst is using the data in the following table to prepare a statistical report.

The cumulative relative frequency for the interval -1.71% ≤ x < 2.03% is closest to:

选项：

A.

0.250.

B.

0.333.

C.

0.583.

解释：

C is correct.

The cumulative relative frequency of an interval identifies the fraction of observations that are less than the upper limit of the given interval. It is determined by summing the relative frequencies from the lowest interval up to and including the given interval. The following table shows the relative frequencies for all the intervals of the data from the previous table:

老师，该题只考虑区间上限，那什么时候需要考虑区间下限

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1 个答案

星星_品职助教 · 2021年08月05日

同学你好，

在cumulative frequency的计算中，都是只考虑上限，不存在考虑下限的情况。

如果只是计算absolute / relative frequency，需要考虑区间，也就是上下限同时考虑。

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