Which of the Following Is the Sum of the Relative

Short Answer

Which of the following is the sum of the relative frequencies for all classes? $\begin{array}{|l|l|}\hline A&\text {The number of classes. }\\\hline B&\text { The class width.}\\\hline C&\text {The total number of observations in the data set. }\\\hline D&\text { One or \( 100 \% \)}\\\hline \end{array}$