问题如下图：
选项：
A. 
B. 
C. 
解释：
没有理想选项B，cumulative frequency到最后不都是100%吗？
NO.PZ2017092702000150 The cumulative frequenof Intervis 100%. The cumulative relative frequenof IntervC is 92.3%. C is correbecause the cumulative relative frequenof intervtells us the fraction of all observations thare less ththe upper limit of interval. For Intervthwoul(2 + 7 + 15)/26 = 92.3%. A is incorrebecause the relative frequenof intervis the absolute frequenof thintervvithe totnumber of observations, here 15/26 = 57.7%. The number 15 represents IntervC’s absolute frequen(also known frequency), whiis simply the actunumber of observations in a given interval. B is incorrebecause the cumulative frequentells us the number of observations thare less ththe upper limit of a return interval, not the percentage of observations meeting thcriteriBecause Intervis the uppermost return interval, its cumulative frequenis the totnumber of observations for all intervals, yielng 2 + 7 + 15 + 2 = 26 annot 100%, whiis the cumulative relative frequenfor Interv 为什么不是15除以26 是不是问C这个范围发生的频率
请问老师B答案错在哪里。
可是讲义的32页那张表里最后一列的Cumulative Frequen就是百分比形式， Culmulative Absolute Frequen才是 累计加数。题目问的是Cumulative Frequency啊？
题目没有图无法答题。
这道题在电脑上表格显示不出来啊。。
