Exercise $2-9$ Static

The accompanying data file contains three numerical variables, $x_1,x_2,$ and $x_3.$

Click here for the Excel Data File

a$.$ For $x_1,$ how many of the observations are greater than $30?$

$\backslash$table$[[$Number of observations,$170]]$

b$.$ Sort by $x_1,$ then by $x_2,$ and then by $x_3,$ all in ascending order. Note that all variables are sorted s have been sorted, what is the first observation for $x_1,x_2,$ and $x_3?$