Let’s first sort the data in ascending order

39,46,46,47,48,48,49,49,51,51,52,53,53,56,66

Makes sense? A little more than when we looked at raw data, I guess..

We now clearly see the minimum value, the maximum value & to an extent an idea about the middle value of the data. Now, let’s start bucketing the number of observations in an interval of 5 starting from the minimum value and covering the maximum value