It is possible for a variable in a data set to be neither numerical nor categorical. One way this happens is that the instrument available to measure the variable can only reach a certain value, and below or above that level, the value cannot be known precisely. In the observations below, any value that is “

A summary of these type of data sets can still be useful.
a) Replace all b) Get Q₁ using the formula in this section.
c) Why is the Q₁ calculation reliable?
d) Calculate the median. Is the median reliable?
e) Would the mean be reliable?

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19.21 14.15 <10 13.75 19.42 18.33 17.21 22.55 < 10 15.15 16.12