NO.PZ2021061603000010
问题如下：
An analyst is using the data in the following exhibit to prepare a statistical report.
The cumulative relative frequency for the bin -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 a bin identifies the fraction of observations that are less than the upper limit of the given bin. It is determined by summing the relative frequencies from the lowest bin up to and including the given bin. The following exhibit shows the relative frequencies for all the bins of the data from the previous exhibit:
The bin-1.71% ≤x < 2.03% has a cumulative relative frequency of 0.583.
请问upper limit -5.45是怎么来的？
