Relaxation Day Spa orders cases of bath salts through a local wholesaler. To summarize several orders worth of data, it may prove beneficial to determine how many orders of bath salts were for $1$ to $15$ cases, between $16$ and $30$ cases, $31$ to $45$ cases, $46$ to $60$ cases, and more than $60$ cases. This is an example of $\_\_\_\_\_\_\_\_.$

Group of answer choices

calculating variances

a probability distribution

grouping the data into bins

sample populations