The accompanying data set contains two variables, x$1$ and x$2.$

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How many observations have x$2$ values equal to $2?$

Sort the data by x$1$ and x$2$ both in ascending order. What are the x$1$ and x$2$ values of the first observation after the data are sorted?

Sort the data by x$1$ and x$2$ both in descending order. What are the x$1$ and x$2$ values of the first observation after the data are sorted?

Sort the data by x$1$ in ascending order and by x$2$ in descending order. What are the x$1$ and x$2$ values of the first observation after the data are sorted?

How many missing values are there in x$1$ and x$2?$

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