S The accompanying data file contains three variables, x1, x2, and Click here for the Excel Data File c x3. a. Bin the values of x1 into three equal-size groups. Label the groups with numbers 1 (lowest values) to 3 (highest values). How many observations are assigned to group 1? Number of observations assigned to group 1 b. Bin the values of x2 into three equal-interval groups. Label the groups with numbers 1 (lowest values) to 3 (highest values). How many observations are assigned to group 3? Number of observations assigned to group 3 c. Bin the values of x3 into the following three groups: 100,000. Label the groups with numbers 1 (lowest values) to 3 (highest values). How many observations are assigned to group 3? Number of observations assigned to group 3