Problem
Some researchers claim that herbal supplements such as ginseng enhance human memory. To test this claim, a researcher asked subjects to consume ginseng for a month prior to testing their memory on a task they had completed once before. The following data is the speed at which they completed the entire task. Construct a frequency table using the following set of data:
55 53 42 43 68 57 70 47 60 51 56 46 40 65 67 45 37 35 50 62