A grouped frequency table can be used to illustrate a hypothetical distribution of simple reaction times for a sample of $20$ participants. Since reaction times encompass a wide range of continuous values, the first column lists ranges of equal width—specifically, intervals such as $141$ to $160$, $161$ to $180$, and up to $241$ to $260$ milliseconds. The second column displays the frequency of participants whose reaction times fall into each respective interval. For instance, the table shows that $9$ participants had reaction times in the $181$ to $200$ millisecond range, effectively summarizing the data into manageable groups.