The cases are US states and one variable is year. Another variable is percent obese in that state, which could be a quantitative variable but here is classified into categories, making it a categorical variable. Using the legend given in Figure $2\mathrm{.}92($and ignoring the category of $$No Data$),$ how many different categories are shown? $($There is one more category already in the online graphs as this book goes to print and maybe another one by the time you are reading this!$)$