Use a line plot. 3. Perform the following commands in R set . seed (11) A = matrix (sample (1:1000 , 500) , 50, 10) (a) (5 points) Find the mean and standard deviation of the rows of A. (b) (5 points) Sort the columns of A. (c) (5 points) Find the summation second smallest number in each column of A (d) (5 points) Swap the first and the second columns of A. (e) (5 points) Add an extra column of zeroes to A