Heights of respondents were recorded as part of a health survey.
The last digits of heights from 31 randomly selected respondents are listed below. Construct a frequency distribution with 10 classes.
Based on the​ distribution, do the heights appear to be estimates or actual​ measurements?

0 0 0 0 0 0 0 0 1 1 2 2 3 3 4 5 5 5 5 5 5 5 5 5 5 6 6 8 8 8 9