did I do this correctly?

The accompanying data file contains three numerical variables, x1,x2, and x3, and one categorical variable, x4 Chlickiliere forl the Excel Data File: a. For x4, how many of the observations are less than three? b. Sort by x1, then by x2, then by x and then by x4, all in ascending order Note that all valiables are sorted simultaneously After the variables have been sorted. What is the first observation for x1:x2. x3 and x4 ? Note: For x1, round your answer to four decimal places. c. Sort by x1, then by x2, then by x3, and then by x4 allinidescending ordet Note that all variables are sorted simultaneously. After the variables have been sorted, what is the first observation for 1 . x2 i. x, and and 4 ? Note: For x1, round your answer to four decimal places. d. How many missing values are there in x1,x2,x3, and x4 ? e. How many observations are there in each category in x4