a$.$ How many observations have x$2$ values equal to $2?$ Number of observations b $.$ Sort the data by x$\_\{1\}$ and then by x$\_\{2\}$ both in ascending order Note that both variables are sorted simultaneously What values of the first observation after the data are sorted $?$ Value of Value of x$\_\{2\}.$ Sort the data by x$\_\{1\}$ and then by x$\_\{2\}$ both in descending order Note that both variables are sorted simultaneously What are th and x$\_\{2\}$ values of the first observation after the data are sorted $?$