Historical Records on a Certain Product Indicate the Following Behavior

Essay

Historical records on a certain product indicate the following behavior for demand. The data represent the number days that the business was open during 2019 (note that it is possible to have more than 365 days as there are multiple store locations). Convert these data into random number intervals.
$$\begin{array} { | r | r | } \hline \text { Demand } & \text { Frequency } \\\hline 17 & 65 \\\hline 18 & 77 \\\hline 19 & 89 \\\hline 20 & 105 \\\hline 21 & 92 \\\hline\end{array}$$